Document more moonlight developer stuff

src/content/docs/dev/helper-scripts.md

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+---
+title: Helper scripts
+sidebar:
+  order: 3
+---
+
+Inside of the moonlight repository, there is a `scripts` folder with some tools in it.
+
+## update.js
+
+Updates the dependency with the given name in all packages.
+
+```shell title="Updating mappings"
+node ./scripts/update.js @moonlight-mod/mappings
+```
+
+## link.js
+
+Links associated packages with pnpm temporarily. **Not recommended, may break your node_modules.**
+
+```shell title="Using and undoing link"
+node ./scripts/link.js
+node ./scripts/link.js --undo
+```

src/content/docs/dev/publishing.mdx

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+---
+title: Publishing a new release
+sidebar:
+  order: 3
+---
+import { Aside } from "@astrojs/starlight/components";
+
+<Aside>This page is mainly here for moonlight core developers who forget what they're doing. Normal users and contributors PRing do not have to do anything here.</Aside>
+<Aside type="caution">When publishing to npm, versions are constant. Exercise caution.</Aside>
+
+## Publishing moonlight
+
+moonlight CI builds the `develop` branch automatically. This section is for publishing a new stable, versioned release.
+
+- Checkout the `main` branch.
+- Merge `develop` into `main`.
+- Update the version in `package.json` and write `CHANGELOG.md`.
+  - Do not append to the changelog - remake it.
+- If any types changes were made in this release, [publish the types](#publishing-types).
+- Commit and push to `main`.
+- Create a tag with the version, **starting with the character `v`**: `git tag vX.Y.Z`
+  - This `v` is very important. CI will not pick it up otherwise. The installers will not know what to do without it.
+- Push the tag: `git push --tags`
+- Checkout the `develop` branch.
+- Merge `main` into `develop`.
+- Push to `develop`.
+
+## Publishing types
+
+- Update the version in `packages/types/package.json`.
+  - The version of types does not need to be in sync with the version of moonlight.
+- Commit and push to `main`.
+  - If releasing a stable build of moonlight, make sure the main version bump and types version bump are in the same commit.
+- Publish the package: `pnpm publish --access public`
+  - Publish from within the `packages/types` directory.
+- In [the sample extension](https://github.com/moonlight-mod/sample-extension), update the types package: `pnpm update @moonlight-mod/types`
+- Commit and push to the sample extension.
+
+## Publishing LunAST/moonmap/mappings
+
+- Update package.json with a new version.
+- Commit and push to `main`.
+- Create a tag with the version, **starting with the character `v`**: `git tag vX.Y.Z`
+  - Same reasoning as [above](#publishing-moonlight).
+- Push the tag: `git push --tags`
+- Wait for the package to be uploaded to npm.
+- Use [the update helper script](/dev/helper-scripts) to update the dependencies in moonlight.