feat(cli): Update header docs link to be conditional for CI environments

[adityasharmawork]

Summary

Updated the CLI header to display environment-aware documentation links based on the runtime environment (CI/CD vs Default).

Changes

• Created a local isCI helper function in packages/cli/src/cli/utils/ui.ts to detect CI environments without external package dependencies.
• Updated the renderHero function to conditionally set the documentation link.
• Changed the link from the static https://lingo.dev/go/docs to dynamic paths: https://lingo.dev/ci (in CI) and https://lingo.dev/cli (default).

Testing

Business logic tests added:

• Verified locally that running node bin/cli.mjs login displays https://lingo.dev/cli in the header by default.
• Verified locally that running CI=true node bin/cli.mjs login displays https://lingo.dev/ci in the header.
• All tests pass locally

Visuals

Required for UI/UX changes:

• Screenshots showing the issue is fixed attached

CLI Mode -

CI Mode -

Checklist

• No breaking changes (or documented below)

Closes #1078

[github-actions]

Hey @adityasharmawork! Just checking in - are you still working on this PR? We noticed there are some comments that may need addressing. If you need more time, no problem! Just let us know. If we don't hear back within a week, we'll close this to keep the repo tidy, but you can always reopen when ready.

[adityasharmawork]

I have already fixed the issue #1078 with this PR #1616
I am waiting for the maintainers to review and merge this PR to main branch!