docs: add docusaurus-plugin-copy-page-button

[portdeveloper]

Summary

• add docusaurus-plugin-copy-page-button to the docs dependencies
• register the plugin in docusaurus.config.ts

Why

Ceramic docs include developer guides and reference content that are useful to bring into AI tools. This adds a page-level copy/open button that exports the current page as clean markdown and includes one-click Open in ChatGPT, Claude, and Gemini actions.

I checked the repo first for existing page-level copy/Open-in-AI UI and LLM export features (CopyPageButton, DocActionsDropdown, copy as markdown, Open in ChatGPT, Open in Claude, llms.txt, docusaurus-plugin-llms, and similar terms) and did not find an overlapping feature.

The plugin has no runtime dependencies and uses peer dependencies for Docusaurus and React.

Validation

• git diff --check
• package manifest, lockfile, and config sanity check

Not run locally: full docs build, due the dependency install/build footprint in this environment.

[portdeveloper]

Quick note: I used my agents to help generate this PR. Feel free to tag me (@portdeveloper) in this thread with any questions and I'll reply asap 🙏

[portdeveloper]

Friendly nudge on this PR — happy to address any feedback if it'd help land it. The plugin recently shipped on react/react-native-website#5085 and continues to see adoption. Thanks for your time!

[portdeveloper]

another gentle nudge on this one 🙏 still mergeable, and the plugin's kept shipping since — redux toolkit just merged it (reduxjs/redux-toolkit#5299), react-native a bit before that. happy to rebase or adjust anything if it helps it land.

[portdeveloper]

going to close this out to keep your queue tidy 🙏 no worries at all — the plugin's still around and the offer stands, so feel free to reopen or ping me anytime if it'd be useful down the line. thanks for your time!