New docs site (#2521)

* initial docs

* more docs work

* Update readme + add license

* update frontend GH action

apps/docs/README.md

@@ -0,0 +1,23 @@
+# Modrinth Documentation
+
+Welcome to the Modrinth documentation! 
+
+## Development
+
+### Pre-requisites
+
+Before you begin, ensure you have the following installed on your machine:
+
+- [Node.js](https://nodejs.org/en/)
+- [pnpm](https://pnpm.io/)
+
+### Setup
+
+Follow these steps to set up your development environment:
+
+```bash
+pnpm install
+pnpm docs:dev
+```
+
+You should now have a development build of the documentation site running with hot-reloading enabled. Any changes you make to the code will automatically refresh the browser.