Add 7 new Git disaster recovery tips

Added 7 new tips covering common Git disasters that developers face: - **Merge conflict resolution** - How to handle scary merge conflicts - **Fixing pushed broken commits** - Using revert instead of reset on public commits - **Recovering deleted branches** - Using reflog to resurrect accidentally deleted branches - **Handling committed secrets** - The nightmare scenario of committed passwords/API keys - **Wrong remote repository fixes** - When you've been pushing to the wrong repo - **Large file cleanup** - Dealing with accidentally committed huge files - **Rebase recovery** - Getting out of rebase hell Each tip follows the same humorous tone and practical format as the existing tips, with real Git commands that actually work.