Remove merge conflict marker from getting-started.md

**Description:**
The file `docs/contributors/getting-started.md` has a git merge conflict marker at line 153:
```
>>>>>>> 3a687c9 (Move new contributor content)
```

**Action:**
Remove this line.

**File:** `docs/contributors/getting-started.md`
**Priority:** High (breaks rendering)
**Effort:** Trivial