This PR updates documentation links to reflect the new paths:

- Update `/settings/postgres` to `/integrations/postgresql`
- Update `/settings/integrations` to `/integrations/circleci`
- Update `/personal` to `/integrations/linear` for Linear configuration

Resolves CG-19221.

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Co-authored-by: codegen-sh[bot] <131295404+codegen-sh[bot]@users.noreply.github.com>
Co-authored-by: Edo Pujol <ed@codegen.com>

# Motivation
Codegen MCP server takes in option repo and org id for the
initialization of the mcp session

<!-- Why is this change necessary? -->

# Content

<!-- Please include a summary of the change -->

Set the organization and repo id headers when setting up claude with the
codegen mcp

# Testing

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# Please check the following before marking your PR as ready for review

- [ ] I have added tests for my changes
- [ x] I have updated the documentation or added new documentation as
needed