update broken documentation references

[maurerle]

Description

This PR updates broken links to working ones.
The broken links seem to be forgotten during updates.

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Checklist

• I've read the contributing guide
• The relevant docs, if any, have been updated or created
• The relevant tests, if any, have been updated or created

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Tests

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Summary by cubic

Fix broken and outdated documentation links across guides and reference examples so readers land on the correct pages. Updates example URLs to match the current docs structure.

• Bug Fixes
  • Running offline guide: telemetry link to /customize/telemetry; Ollama provider link to /customize/model-providers/top-level/ollama.
  • Reference examples: startUrl to /index; JSON example startUrl to /getting-started/overview and favicon to https://www.continue.dev/favicon.png.
  • Netlify MCP guide: update "Continue Guides" link to /guides/configuring-models-rules-tools.

^{Written for commit b3e1249. Summary will update on new commits.}

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[cubic-dev-ai]

No issues found across 4 files