docs(contributing): add dependencies overriding section

Refs: <pimalaya/core#32>

CONTRIBUTING.md

@@ -4,19 +4,66 @@ Thank you for investing your time in contributing to Himalaya CLI!
 
 ## Development
 
-The development environment is managed by [Nix](https://nixos.org/download.html). Running `nix-shell` will spawn a shell with everything you need to get started with the lib: `cargo`, `cargo-watch`, `rust-bin`, `rust-analyzer`, `notmuch`…
+The development environment is managed by [Nix](https://nixos.org/download.html).
+Running `nix-shell` will spawn a shell with everything you need to get started with the lib.
 
-```sh
-# Start a Nix shell
-$ nix-shell
+If you do not want to use Nix, you can either use [rustup](https://rust-lang.github.io/rustup/index.html):
 
-# then build the CLI
-$ cargo build
+```text
+rustup update
+```
+
+or install manually the following dependencies:
+
+- [cargo](https://doc.rust-lang.org/cargo/) (`v1.82`)
+- [rustc](https://doc.rust-lang.org/stable/rustc/platform-support.html) (`v1.82`)
+
+## Build
+
+```text
+cargo build
+```
+
+You can disable default [features](https://doc.rust-lang.org/cargo/reference/features.html) with `--no-default-features` and enable features with `--features feat1,feat2,feat3`.
+
+Finally, you can build a release with `--release`:
 
-# run the CLI
-$ cargo run --feature pgp-gpg -- envelope list
+```text
+cargo build --no-default-features --features imap,smtp,keyring --release
 ```
 
+## Override dependencies
+
+If you want to build Himalaya CLI with a dependency installed locally (for example `email-lib`), then you can [override it](https://doc.rust-lang.org/cargo/reference/overriding-dependencies.html) by adding the following lines at the end of `Cargo.toml`:
+
+```toml
+[patch.crates-io]
+email-lib = { path = "/path/to/email-lib" }
+```
+
+If you get the following error:
+
+```text
+note: perhaps two different versions of crate email are being used?
+```
+
+then you may need to override more Pimalaya's sub-dependencies:
+
+```toml
+[patch.crates-io]
+email-lib.path = "/path/to/core/email"
+imap-client.path = "/path/to/imap-client"
+keyring-lib.path = "/path/to/core/keyring"
+mml-lib.path = "/path/to/core/mml"
+oauth-lib.path = "/path/to/core/oauth"
+pgp-lib.path = "/path/to/core/pgp"
+pimalaya-tui.path = "/path/to/tui"
+process-lib.path = "/path/to/core/process"
+secret-lib.path = "/path/to/core/secret"
+```
+
+*See [pimalaya/core#32](https://github.com/pimalaya/core/issues/32) for more information.*
+
 ## Commit style
 
 Starting from the `v1.0.0`, Himalaya CLI tries to adopt the [conventional commits specification](https://github.com/conventional-commits/conventionalcommits.org).