Added tip to docs; Use same message in trk stop + git commit

What's Changed

• Improvements to basic usage documentation by @dvklopfenstein in #72
• Move advanced git init material from basic usage to advanced usage by @dvklopfenstein in #73
• v0.8.5 by @dvklopfenstein in #74
• v0.8.6 Added to documentation by @dvklopfenstein in #75

Full Changelog: v0.8.5...v0.8.6