docs: fix up some README links

- https://github.com/ziglang/zig-bootstrap -> https://codeberg.org/ziglang/zig-bootstrap
- https://github.com/ziglang/qemu-static -> https://codeberg.org/ziglang/qemu-static
- Add <...> around bare URLs
- Link to tips inside README.md, rather than in CONTRIBUTING.md
5cb72fce91Eamon Burns committed on 11/26/2025, 8:36:58 AM· committed by Alex Rønne Petersenparent6ef3af4
1 file changedLine totals unavailable