Fix bug in self check that broke the script completely

Fixes bug where the script blocks urls on the sync server page

- Implemented monitoring of changes to webpage elements to block new links
- Fixed bug where script doesnt work until page is completely loaded
- Added support for blocking all elements with the same url

- Migrate all settings and URL management to the sync server web interface
- Replace all promise.then with async await
- Replace callback architecture with function returns and await
- Move all accesses to the sync server from the content script to the background script

Fix broken sort

Sorts list of urls on options page

Migrated API to process multiple URLs in a single request
Refactored API code to its own file
Code cleanup and simplification

Major Update

- Split App into client server architecture
- Consolidate link blocking and blocked page to one content script
- Enabled mobile capability

Added Context Menu for blocking links
Hides links to blocked pages on other pages