feat(docs): migrate documentation site into monorepo (#5912)

apps/docs/docs/getting-started/installation/source.mdx

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+---
+title: From source
+---
+
+# (Not recommended): From source
+
+:::caution
+
+Installing from source is a bad idea in many ways:
+
+- No isolation between applications
+- Dependency conflicts on your root operating system
+- Cumbersome update process
+- Permission management
+- Handling of conflicts
+
+Therefore, we highly discourage you from using this as a normal user.
+This method is only useful, when you want to develop on Homarr or extend it with your own functionality.
+
+:::
+
+## Prerequisites
+
+- [Node.js](https://nodejs.org/en/download/)
+- [pnpm](https://pnpm.io/installation)
+- [Redis](https://redis.io/download)
+
+## Steps
+
+<ol>
+  <li>Clone the Repository using <code>git clone https://github.com/homarr-labs/homarr.git</code></li>
+  <li>Enter the created directory using <code>cd homarr</code></li>
+  <li>Install all dependencies using <code>pnpm install</code></li>
+  <li>Copy the `.env.example` file to `.env` and replace `DB_URL` with the full path you want to use for the sqlite database file. For example `DB_URL='/home/username/homarr/db.sqlite`</li>
+  <li>Replace `AUTH_SECRET` and `SECRET_ENCRYPTION_KEY` both with a secure random string by using `openssl rand -hex 32`</li>
+  <li>Replace `CRON_JOB_API_KEY` with a secure random string by using `openssl rand -base64 32`</li>
+  <li>Run `pnpm run db:migration:sqlite:run` and wait that it completes</li>
+  <li>Build the source using `pnpm build`</li>
+  <li>Copy better-sqlite3.node files with `mkdir build` and `cp ./node_modules/better-sqlite3/build/Release/better_sqlite3.node ./build/better_sqlite3.node`</li>
+  <li>Start a redis server using `redis-server`</li>
+  <li>Run the server using `pnpm start`</li>
+  <li>Open `http://localhost:3000` in your browser</li>
+</ol>