Docs modifications (#5804)

- Fixes #5504
- Fixes #5503
- Return 404 when the page does not exist
- Modified the footer in order to align it properly
- Removed "noticed something to change" in each table of content
- Fixed the URLs of the edit module 
- Added the edit module to Developers
- Fixed header style on the REST API page.
- Edited the README to point to Developers
- Fixed selected state when clicking on sidebar elements

---------

Co-authored-by: Félix Malfait <felix.malfait@gmail.com>

packages/twenty-docs/package.json

@@ -1,37 +0,0 @@
-{
-  "name": "twenty-docs",
-  "version": "0.12.2",
-  "private": true,
-  "scripts": {
-    "nx": "NX_DEFAULT_PROJECT=twenty-docs node ../../node_modules/nx/bin/nx.js",
-    "docusaurus": "npx docusaurus",
-    "start": "npx docusaurus start --host 0.0.0.0 --port 5001",
-    "build": "npx docusaurus build",
-    "swizzle": "npx docusaurus swizzle",
-    "deploy": "npx docusaurus deploy",
-    "clear": "npx docusaurus clear",
-    "serve": "npx docusaurus serve",
-    "write-translations": "npx docusaurus write-translations",
-    "write-heading-ids": "npx docusaurus write-heading-ids",
-    "typecheck": "npx tsc"
-  },
-  "overrides": {
-    "trim": "^0.0.3",
-    "got": "^11.8.5"
-  },
-  "browserslist": {
-    "production": [
-      ">0.5%",
-      "not dead",
-      "not op_mini all"
-    ],
-    "development": [
-      "last 1 chrome version",
-      "last 1 firefox version",
-      "last 1 safari version"
-    ]
-  },
-  "engines": {
-    "node": ">=16.14"
-  }
-}