chore: Changelog, License, Markdown reformatting

• Add license (#169 - closed) to Axii
• Add `git reconfigure` to README (#175 - closed)
• Update changelog
• Updated maintainer's docs to include updating changelog
• Move all tool-specific docs (VSCode, Ninja, autojump, Ccache, ...) to advanced user's docs
• Create two modules for ninja and ccache for unified usage (similar to gcc, clang, ...)