Document how to use a moor beta/dev version on website

docs/content/en/docs/Internals/_index.md

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+---
+title: "Moor internals"
+weight: 300000
+description: Work in progress documentation on moor internals
+---
+
+## Using an unreleased moor version
+
+To try out new moor features, you can choose to use a development or beta version of moor before it's
+published to pub. For that, add an `dependency_overrides` section to your pubspec:
+
+```yaml
+dependency_overrides:
+  moor:
+    git:
+      url: https://github.com/simolus3/moor.git
+      ref: beta
+      path: moor
+  moor_ffi:
+    git:
+      url: https://github.com/simolus3/moor.git
+      ref: beta
+      path: moor_ffi
+  moor_generator:
+    git:
+      url: https://github.com/simolus3/moor.git
+      ref: beta
+      path: moor_generator
+  sqlparser:
+    git:
+      url: https://github.com/simolus3/moor.git
+      ref: beta
+      path: sqlparser
+```
+
+If you're using `moor_flutter`, just exchange `moor_ffi` with `moor_flutter` in the package name
+and path. To use the bleeding edge of moor, change `ref: beta` to `ref: develop` for all packages.