Update to MV3 including critical bug fixes

[chucem]

This upgrade to the manifest version 3 #49

it includes the fixes of #63

[what-the-diff]

PR Summary

• Changed extension API use
  Replaced deprecated chrome.browserAction with the updated chrome.action.

• New script file and loading method
  Introduced a new script file (popup) and updated the way it is loaded in contentScript.

• Improved keyboard shortcuts
  Fixed bugs related to keyboard shortcuts and added a new alt+a shortcut for active topics search page.

• Removed jQuery dependency
  Replaced jQuery dependency in newResponseNotification with a modern fetch call.

• Updated manifest version
  Upgraded the manifest version from 2 to 3 to ensure compatibility with newer Chrome systems.

• New action object and permissions
  Added a new action object with a default icon, updated popup page location, and updated permissions to support declarativeNetRequest.

• Organized web_accessible_resources
  Moved web_accessible_resources into a separate array for easier future updates and scalability.

[mordechairoth]

@chucem I wanna update the extension, I didn't look at it/use it for while now.
Can I safely merge this into master and it will work with the new ivelt update?

[chucem]

@mordechairoth yes but I just did a update because of new chrome limits for the storage.sync, I made an other branch where I migrate to local, (it will not sync to all computers, but will have less limits)

see #66