Fix Findings timeline scroll overflow

fix: handling URL encoding to ensure proper handling of special chara…

…cters in tagname

fix: improve focus mode with complete node filtering and proper resto…

…ration

fix: add context rename functionality

- Add update_context function to backend CRUD
- Add PUT endpoint for contexts API
- Fixes 405 error when trying to rename contexts

Merging @Gepardgame Dockerfile+nginx conf

Updating readme + adding utils script