Document how to develop the documentation

docs/README.md

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+# Nostr Docs
+
+VitePress-powered documentation for the Nostr Ruby gem.
+
+## Live Demo
+
+https://nostr-omega.vercel.app/
+
+## Development
+
+### Requirements
+
+- [Bun](https://bun.sh/)
+
+### Installation
+
+```shell
+bun install
+```
+
+### Tasks
+
+The `docs:dev` script will start a local dev server with instant hot updates. Run it with the following command:
+
+```shell
+bun run docs:dev
+```
+
+Run this command to build the docs:
+
+```shell
+bun run docs:build
+```
+
+Once built, preview it locally by running:
+
+```shell
+bun run docs:preview
+```
+
+The preview command will boot up a local static web server that will serve the output directory .`vitepress/dist` at
+http://localhost:4173. You can use this to make sure everything looks good before pushing to production.
+
+