docs: simplify readme

Author: kamadorueda

README.md

@@ -95,33 +95,9 @@
   We integrate with common code editors and workflows:
 
   - [Alejandra extension for Visual Studio Code](https://marketplace.visualstudio.com/items?itemName=kamadorueda.alejandra)
-  - [Doom-emacs](https://github.com/hlissner/doom-emacs):
-
-    ```
-    (set-formatter! 'alejandra "alejandra --quiet" :modes '(nix-mode))
-    ```
-
-  - [Pre-commit](https://pre-commit.com/):
-
-    ```yaml
-    repos:
-      - repo: https://github.com/kamadorueda/alejandra
-        rev: 1.4.0
-        hooks:
-          # Choose one of the following:
-          - id: alejandra # Requires Nix to be previously installed in the system
-          - id: alejandra-system # Requires Alejandra to be previously installed in the system
-    ```
-    
-  - [pre-commit-hooks.nix](https://github.com/cachix/pre-commit-hooks.nix)
-  
-    ```nix
-    pre-commit-check = pre-commit-hooks.lib.${system}.run {
-      hooks = {
-        alejandra.enable = true;
-      };
-    };
-    ```
+  - [Doom-emacs](./integrations/doom-emacs/README.md)
+  - [Pre-commit](./integrations/pre-commit/README.md)
+  - [pre-commit-hooks.nix](./integrations/pre-commit-hooks-nix/README.md)
 
 ## Getting started
 

integrations/doom-emacs/README.md

@@ -0,0 +1,10 @@
+# Doom-Emacs integration
+
+In order to configure Alejandra in
+[Doom-emacs](https://github.com/hlissner/doom-emacs):
+
+Just use the following:
+
+```lisp
+(set-formatter! 'alejandra "alejandra --quiet" :modes '(nix-mode))
+```

integrations/pre-commit-hooks-nix/README.md

@@ -0,0 +1,15 @@
+# Pre-commit-hooks.nix integration
+
+In order to use Alejandra with
+[pre-commit-hooks.nix](https://github.com/cachix/pre-commit-hooks.nix),
+use a file like the following:
+
+```nix
+{
+  pre-commit-check = pre-commit-hooks.lib.${system}.run {
+    hooks = {
+      alejandra.enable = true;
+    };
+  };
+}
+```

integrations/pre-commit/README.md

@@ -0,0 +1,21 @@
+# Pre-Commit integration
+
+In order to configure Alejandra in
+[Pre-Commit](https://pre-commit.com/),
+
+First create a file named `.pre-commit-config.yaml`,
+with contents:
+
+```yaml
+repos:
+  - repo: https://github.com/kamadorueda/alejandra
+    rev: 1.4.0
+    # Choose either the 'alejandra' or 'alejandra-system' hook
+    # depending on what pre-requisites you have:
+    hooks:
+      # Requires Nix to be previously installed in the system
+      - id: alejandra
+
+      # Requires Alejandra to be previously installed in the system
+      - id: alejandra-system
+```