feat(docs): customize Obot URL in examples

[calvinmclean]

Improve copy/paste ability from docs by allowing users to set their own URL

[Copilot]

Pull request overview

This PR improves the copy/paste usability of the Docusaurus docs by letting readers configure their own Obot base URL and automatically substituting it into code examples on selected pages.

Changes:

• Added a “Set Obot URL” custom navbar item that stores a user-provided base URL in localStorage.
• Added a CodeBlock theme override that conditionally rewrites https://obot.example.com in code blocks to the configured URL when pages opt in via an ObotUrlExamples provider.
• Updated several docs pages to wrap their content in ObotUrlExamples and adjust text accordingly.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 7 comments.

Show a summary per file

File	Description
docs/src/theme/NavbarItem/ComponentTypes.tsx	Registers a custom navbar item type for the URL picker.
docs/src/theme/CodeBlock/index.tsx	Overrides CodeBlock to optionally rewrite example URLs.
docs/src/lib/obotUrl.ts	Adds URL normalization, storage, and React hooks/context for the configured URL.
docs/src/components/ObotUrlNavbarItem/index.tsx	Implements the navbar UI (dialog + validation + presets) to set the URL.
docs/src/components/ObotUrlNavbarItem/styles.module.css	Styles for the navbar trigger and modal dialog.
docs/src/components/ObotUrlExamples/index.tsx	Opt-in provider to enable example URL rewriting on specific pages.
docs/docusaurus.config.ts	Adds the custom navbar item to the docs navbar configuration.
docs/docs/installation/cli-setup.md	Wraps the page with ObotUrlExamples and updates guidance to match the new behavior.
docs/docs/functionality/llm-gateway.md	Wraps the page with ObotUrlExamples and updates guidance to match the new behavior.
docs/docs/functionality/api-keys.md	Wraps the page with ObotUrlExamples and updates guidance to match the new behavior.

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