Fix README: remove HEAD markers and finalize donation section

Author: asyscom

README.md

@@ -138,11 +138,7 @@ Logs are written to `nodesentinel.log` in the project directory.
 
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 ## 🧰 Troubleshooting
 
 | Issue | Possible Fix |
@@ -159,15 +155,12 @@ Logs are written to `nodesentinel.log` in the project directory.
 See `requirements.txt` for all dependencies.
 
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 ## Support / Donate
 
 If you like this work and want to support it, you can donate via Lightning to `davidebtc@walletofsatoshi.com` or via BTC on-chain to `bc1qqksvzgksjgmffmggyg836h45le3d5aq5d5xqj0`. ⚡💰
 
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 ## 💡 Contributing
 Pull requests welcome! For issues, open a GitHub ticket.