Add basic command documentation for plugin-add, plugin-remove, setup,…

… and update. (#238)

* Add basic command documentation for plugin-add, plugin-remove, setup, and update.

* Update lando version docs.

docs/plugin-add.md

@@ -0,0 +1,25 @@
+---
+title: lando plugin-add
+description: lando plugin-add installs the plugin(s) indicated in the primary argument.
+---
+
+# plugin-add
+
+Installs plugins.
+
+This will install the plugin(s) indicated in the primary argument and add them to Lando's plugin registry. Plugins will be installed in your `.lando/plugins` directory and updated when `lando update` is executed.
+
+## Usage
+
+```bash
+lando plugin-add <plugin> [plugins...]
+```
+
+## Options
+
+```bash
+  --channel   Sets the update channel   [array] [choices: "edge", "none", "stable"]
+  --help      Shows lando or delegated command help if applicable   [boolean]
+  --auth, -a  Use global or scoped auth   [array] [default: []]
+  --registry, -r, -s, --scope  Use global or scoped registry    [array] [default: []]
+```

docs/plugin-remove.md

@@ -0,0 +1,23 @@
+---
+title: lando plugin-remove
+description: lando plugin-remove removes the plugin(s) indicated in the primary argument.
+---
+
+# plugin-remove
+
+Removes plugins..
+
+This will remove the plugin(s) indicated in the primary argument from Lando's plugin registry and from your `.lando/plugins` directory.
+
+## Usage
+
+```bash
+lando plugin-remove <plugin> [plugins...]
+```
+
+## Options
+
+```bash
+  --channel   Sets the update channel   [array] [choices: "edge", "none", "stable"]
+  --help      Shows lando or delegated command help if applicable   [boolean]
+```

docs/setup.md

@@ -0,0 +1,23 @@
+---
+title: lando setup
+description: lando setup installs the constituent components of Lando. 
+---
+
+# setup
+
+setups Lando.
+
+This will setup all the constituent components of Lando, including `@lando/core`, `@lando/cli`, and all of the default Lando plugins (currently all plugins in the[`@lando` org](https://github.com/lando)).
+
+## Usage
+
+```bash
+lando setup
+```
+
+## Options
+
+```bash
+  --help      Shows lando or delegated command help if applicable   [boolean]
+  --yes, -y   Runs non-interactively with all accepted default answers    [boolean] [default: false]
+```

docs/update.md

@@ -0,0 +1,23 @@
+---
+title: lando update
+description: lando update updates all of Lando's components, including installed plugins.
+---
+
+# update
+
+Updates Lando.
+
+This will update all the constituent components of Lando, including `@lando/core`, `@lando/cli`, and any Lando plugins you may have installed (ex: `@lando/php`).
+
+## Usage
+
+```bash
+lando update
+```
+
+## Options
+
+```bash
+  --help      Shows lando or delegated command help if applicable   [boolean]
+  --yes, -y   Runs non-interactively with all accepted default answers    [boolean] [default: false]
+```

docs/version.md

@@ -5,7 +5,7 @@ description: If you can't guess what this command does you might want to conside
 
 # version
 
-Displays the lando version.
+Displays the version of Lando and optionally its component plugins.
 
 ## Usage
 
@@ -16,6 +16,9 @@ lando version
 ## Options
 
 ```bash
---help         Shows lando or delegated command help if applicable
---verbose, -v  Runs with extra verbosity
+--help           Shows lando or delegated command help if applicable
+--verbose, -v    Runs with extra verbosity
+--all, -a        Show all version information
+--component, -c  Show version info for specific component
+--full, -f       Show full version string
 ```