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>

.github/workflows/ci-docs.yaml

@@ -1,42 +0,0 @@
-name: CI Docs
-on:
-  push:
-    branches:
-      - main
-    paths:
-      - 'package.json'
-      - 'packages/twenty-docs/**'
-      - 'packages/twenty-ui/**'
-  pull_request:
-    paths:
-      - 'package.json'
-      - 'packages/twenty-docs/**'
-      - 'packages/twenty-ui/**'
-concurrency:
-  group: ${{ github.workflow }}-${{ github.ref }}
-  cancel-in-progress: true
-
-jobs:
-  docs-build:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - name: Install dependencies
-        uses: ./.github/workflows/actions/yarn-install
-      - name: Docs / Build Documentation
-        run: npx nx build twenty-docs
-  vale:
-    name: runner / vale
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - uses: errata-ai/vale-action@reviewdog
-        with:
-          files: ${{ steps.directories.outputs.LIST }}
-          fail_on_error: true
-          vale_flags: "--minAlertLevel=error"
-          reporter: github-pr-check
-          token: ${{ github.token }}
-          filter_mode: nofilter
-        env:
-          REVIEWDOG_GITHUB_API_TOKEN: ${{ github.token }}