Docs: Provider connections page + cross-links (preview, local-only) (#15492) - #717

Running Vale across on the following files affected by this PR:

- openhands/usage/agent-canvas/customize-and-settings.mdx
- openhands/usage/agent-canvas/first-time-setup.mdx
- openhands/usage/agent-canvas/llm-profiles.mdx
- openhands/usage/settings/llm-settings.mdx
- openhands/usage/agent-canvas/provider-connections.mdx

Attempting to initialize Vale linter...
No customer vale configuration detected. Using Mintlify's default configuration.
Attempting to run Vale spellcheck...
Vale spellcheck completed successfully.

openhands/usage/agent-canvas/first-time-setup.mdx:
	- 15:21    Did you really mean 'Anthropic's'?
	- 78:30    Did you really mean 'automations'?

openhands/usage/agent-canvas/llm-profiles.mdx:
	- 52:34      Did you really mean 'Ollama'?
	- 52:48      Did you really mean 'SGLang'?
	- 62:67      Did you really mean 'Ollama'?
	- 103:107    Did you really mean 'reachability'?

openhands/usage/settings/llm-settings.mdx:
	- 9:14      Did you really mean 'litellm'?
	- 176:32    Did you really mean 'switch_llm'?


Found 8 suggested changes across 3 files in 481.04ms