Stop pointing to playground & other readme fixes

README.md

@@ -1,18 +1,18 @@
 [![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.8313341.svg)](https://doi.org/10.5281/zenodo.8313341)
 [![](https://github.com/nfdi4cat/voc4cat/workflows/Publish/badge.svg)](https://github.com/nfdi4cat/voc4cat/actions)
 [![](https://github.com/nfdi4cat/voc4cat/workflows/Build/badge.svg)](https://github.com/nfdi4cat/voc4cat/actions)
-[<img src="https://www.w3.org/Icons/SW/Buttons/sw-skos-blue-v.svg" height="20" />](https://www.w3.org/TR/skos-primer/)
+[<img src="https://www.w3.org/Icons/SW/Buttons/sw-skos-blue-v.svg" height="20" alt="SKOS logo" />](https://www.w3.org/TR/skos-primer/)
 
 # A SKOS vocabulary for the catalysis disciplines
 
 > **The first collection of terms was published in June 2023.**
 > **Our goal is to grow the vocabulary to cover all subdisciplines of catalysis.**
->**Please join if you like to help. Everyone is welcome!**
+> **Please join if you like to help.**
 
 The vocabulary has been created and maintained as part of the [NFDI4Cat](http://www.nfdi4cat.org) initiative and follows our [Voc4Cat Guidelines](https://doi.org/10.5281/zenodo.7669183).
 
 This repository was created from the template [voc4cat-template](https://github.com/nfdi4cat/voc4cat-template).
-It uses the [voc4cat-tool](https://github.com/nfdi4cat/voc4cat-tool) and GitHub features like pull requests, gh-actions, gh-pages etc. to reduce the maintenance workload for contributors and editors.
+It uses the [voc4cat-tool](https://github.com/nfdi4cat/voc4cat-tool) and GitHub features like pull requests, actions, pages etc. to reduce the maintenance workload for contributors and editors.
 
 ## Basic principles
 
@@ -22,21 +22,21 @@ We tried hard to make contributing easy. The process is essentially *(see furthe
 - Edit the vocabulary file in Excel,
 - Submit a pull request with the updated file placed in the folder `inbox-excel-vocabs`.<BR>It is important to keep the original file name `voc4cat.xlsx`.
 
-After approval your pull request is ready to be merged by the editors. The merge will integrate your contribution into the SKOS-vocabulary files in the `vocabularies`-folder. Upon merge the corresponding documentation and a joined turtle file will be automatically built and published to gh-pages.
+After approval your pull request is ready to be merged by the editors. The merge will integrate your contribution into the SKOS-vocabulary files in the `vocabularies`-folder. Upon merge the corresponding documentation and a joined turtle file will be automatically built and published to GitHub pages.
 
 Besides this "in-development" version of the vocabulary, the latest released version and older releases are also available.
 
 Links to specific versions:
 
 - latest released version
   - https://w3id.org/nfdi4cat/voc4cat
-- "in-development" vesion (built from most recent commit to main)
+- "in-development" version (built from most recent commit to main)
   - `voc4cat` vocabulary documentation https://w3id.org/nfdi4cat/voc4cat/dev
 - current and earlier releases identified by release date (the "v" before the data is optional)
   - General scheme `https://w3id.org/nfdi4cat/voc4cat/{release-tag}`<BR>for example https://w3id.org/nfdi4cat/voc4cat/v2023-08-17
 
-We have configured [content negotiation](https://en.wikipedia.org/wiki/Content_negotiation) for these urls.
-So you can get the human readable HTML documentation but also the machine-readable turtle file of the vocabulary from the same url.
+We have configured [content negotiation](https://en.wikipedia.org/wiki/Content_negotiation) for these URLs.
+So you can get the human readable HTML documentation but also the machine-readable turtle file of the vocabulary from the same URL.
 The IRI-design is described in detail in [iri-design.md](https://github.com/nfdi4cat/voc4cat/blob/main/iri-design.md).
 
 To get the turtle file you may use tools like [curl](https://curl.se/) or [httpie](https://httpie.io/docs/cli) that allow to specify the content type. For example, to download the turtle file of the latest released version:
@@ -54,7 +54,7 @@ We also provide links to turtle files of individual concepts and collections:
 - for releases by date-tag `https://w3id.org/nfdi4cat/voc4cat/{release-tag}/voc4cat_{NUMERIC-ID}.ttl`<BR>for example https://w3id.org/nfdi4cat/voc4cat/v2023-08-17/voc4cat_0000123
 
 In addition to the specific versions, an [index page](https://nfdi4cat.github.io/voc4cat/) is generated that links to all tagged releases.
-It is placed at the root of gh-pages.
+It is placed at the root of the gh-pages branch.
 
 To see how voc4cat rates in the [qSKOS](https://github.com/cmader/qSKOS) quality checks,
 you can use this link to the [SKOS testing tool](http://skos-play.sparna.fr/skos-testing-tool/test?url=https://nfdi4cat.github.io/voc4cat/dev/voc4cat.ttl&rules=anr,chr,dcc,dlv,el,hr,husv,ilc,ipl,ml,mri,ncl,oc,oilt,ol,otc,rc,rrc,strc,tchbc,uc,ucil,urc&format=html).
@@ -65,12 +65,10 @@ To discuss about the **voc4cat**-vocabulary maintained here, create an [issue](h
 
 To contribute new concepts or collections or change existing ones, you may either submit your contributions as Excel/xlsx-file or (as an expert) as new/changed turtle file.
 
-> *To try out the workflow with some example data, you may use [voc4cat-playground](https://github.com/nfdi4cat/voc4cat-playground) which is almost identical to this repository but is not meant to last.*
-
 Here are the steps for submitting updates in Excel.
 
 - Get the Excel/xlsx-vocabulary file
-  - The most recent version of the vocabulary is always available via github-pages https://nfdi4cat.github.io/voc4cat/dev/voc4cat.xlsx
+  - The most recent version of the vocabulary is always available via GitHub-pages https://nfdi4cat.github.io/voc4cat/dev/voc4cat.xlsx
 - Make changes to the Excel file. If you want to add something new you need to [request a range of IDs](https://github.com/nfdi4cat/voc4cat/issues/new/choose) for you.
 - Add the xlsx file to your clone of the repository into the folder `inbox-excel-vocabs`
   - The name of the file must match the vocabulary that you want to update. So do not change the filename, but keep `voc4cat.xlsx`.
@@ -93,16 +91,15 @@ See [inbox-excel-vocabs/README.md](inbox-excel-vocabs/README.md) for a minimal e
 
 To discuss about the workflow for maintaining SKOS vocabularies based on this template, create an [voc4cat-template issue](https://github.com/nfdi4cat/voc4cat-template/issues).
 
-To discuss about the tool that converts Excel to SKOS in gh-actions of this template, create an [voc4cat-tool issue](https://github.com/nfdi4cat/voc4cat-tool/issues).
+To discuss about the tool that converts Excel to SKOS in GitHub-actions of this template, create an [voc4cat-tool issue](https://github.com/nfdi4cat/voc4cat-tool/issues).
 
 ## Contributors
 
 For details see the Zenodo record.
 
 **A big thanks to our GitHub contributors:**
-
 <a href="https://github.com/nfdi4cat/voc4cat/graphs/contributors">
-  <img src="https://contrib.rocks/image?repo=nfdi4cat/voc4cat" />
+  <img src="https://contrib.rocks/image?repo=nfdi4cat/voc4cat" alt="Voc4Cat contributors"/>
 </a>
 
 *Figure made with [contrib.rocks](https://contrib.rocks).*
@@ -121,4 +118,4 @@ The template itself is CC0-1.0 licensed, see [LICENSE](LICENSE). Although there
 
 This work was funded by the German Research Foundation (DFG) through the project "[NFDI4Cat](https://www.nfdi4cat.org) - NFDI for Catalysis-Related Sciences" (DFG project no. [441926934](https://gepris.dfg.de/gepris/projekt/441926934)), within the National Research Data Infrastructure ([NFDI](https://www.nfdi.de)) programme of the Joint Science Conference (GWK).
 
-We thank the [W3ID Consortium](https://w3id.org) for making its permanent url service available to the community.
+We thank the [W3ID Consortium](https://w3id.org) for making its permanent URL service available to the community.