docs: fix readme relative link (Separate local & CI tests)

[FirentisTFW]

Description

I noticed that the relative link for Separate local & CI tests entry under Feature Overview in README is not working. I created a PR to fix it since it's one of the first links in README and may be potentially clicked a lot.

I've read the contribution guidelines, but I decided not to create an issue for it first, since this is a rather simple, non-invasive change. I can always create it, though.

Type of Change

• [ ] ✨ New feature (non-breaking change which adds functionality)
• [x] 🛠️ Bug fix (non-breaking change which fixes an issue)
• [ ] ❌ Breaking change (fix or feature that would cause existing functionality to change)
• [ ] 🧹 Code refactor
• [ ] ✅ Build configuration change
• [x] 📝 Documentation
• [ ] 🗑️ Chore

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (cd09414) 100.00% compared to head (7cce2b8) 100.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #100 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 13 13 Lines 562 562 ========================================= Hits 562 562 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.