move contributing formatting to new page

Author: notrab

CONTRIBUTING.md

@@ -6,24 +6,6 @@ Thank you for your interest in contributing to ENSNode! We welcome contributions
 
 For detailed setup instructions, visit the [ENSNode Contributing Guide](https://ensnode.io/docs/reference/contributing).
 
-## Using Biome and Prettier together
-
-Biome is our primary formatter; the long-term goal is to use it for everything. Two gaps remain today:
-
-- Biome doesn't format Markdown, so Prettier handles `**/*.{md,mdx}` repo-wide.
-- Biome's `.astro` support only covers the frontmatter (the `---` script block). Prettier with `prettier-plugin-astro` handles the template portion in `docs/ensnode.io` and `docs/ensrainbow.io`. The `astroSkipFrontmatter: true` option keeps Biome in charge of the frontmatter so the two formatters don't fight over the same code.
-
-Run `pnpm lint` at the monorepo root to apply both. CI runs `pnpm lint:ci` (check-only).
-
-### Windows: line-ending diffs
-
-Git on Windows defaults to checking files out with CRLF (`\r\n`) line endings, but Biome and Prettier always write LF (`\n`). After running `pnpm lint`, files can show as modified even though Git will normalize them back to LF when staged — so the change wouldn't actually land in a commit.
-
-To clear the noise, pick one:
-
-- One-off: `git add --all`. Staging normalizes the line endings and the entries drop out of `git status`.
-- Permanent: `git config --global core.autocrlf input`, then `git checkout -- .` to convert your working tree to LF. Future checkouts won't reintroduce CRLF.
-
 ## Getting Help
 
 If you have questions or need help, please:

docs/ensnode.io/src/content/docs/docs/reference/contributing/formatting.mdx

@@ -0,0 +1,29 @@
+---
+title: Formatting with Biome and Prettier
+sidebar:
+  label: Formatting
+  order: 6
+---
+
+Biome is our primary formatter; the long-term goal is to use it for everything. Two gaps remain today:
+
+- Biome doesn't format Markdown, so Prettier handles `**/*.{md,mdx}` repo-wide.
+- Biome's `.astro` support only covers the frontmatter (the `---` script block). Prettier with [`prettier-plugin-astro`](https://github.com/withastro/prettier-plugin-astro) handles the template portion in `docs/ensnode.io` and `docs/ensrainbow.io`. The `astroSkipFrontmatter: true` option keeps Biome in charge of the frontmatter so the two formatters don't fight over the same code.
+
+## Running the formatters
+
+```bash
+# from the monorepo root
+pnpm lint
+```
+
+CI runs `pnpm lint:ci` (check-only) on every PR.
+
+## Windows: line-ending diffs
+
+Git on Windows defaults to checking files out with CRLF (`\r\n`) line endings, but Biome and Prettier always write LF (`\n`). After running `pnpm lint`, files can show as modified even though Git will normalize them back to LF when staged — so the change wouldn't actually land in a commit.
+
+To clear the noise, pick one:
+
+- **One-off**: `git add --all`. Staging normalizes the line endings and the entries drop out of `git status`.
+- **Permanent**: `git config --global core.autocrlf input`, then `git checkout -- .` to convert your working tree to LF. Future checkouts won't reintroduce CRLF.