Migrate to manifest v3

[Aarav-Juneja]

Summary

Updated extension to manifest v3. This should resolve #52.

Details and comments

I didn't completely understand the code, so I may have done something wrong. I deleted the background.js file in the extension. I found this code to be duplicated in the popup.js file. I also removed the content.js from the background scripts because it was already labeled as a content script. Can I also get this PR under hacktoberfest. Lastly, I am unsure what, if any, documentation changes are needed.

[gobbledy-gook]

I would like to see you try to unpack this extension on your own system and check if this is working perfectly fine. Share a screenshot of the same.

[Aarav-Juneja]

I found a bug and have now fixed it. We were reloading the popup file every page to ensure the data is up to date. I have now changed it so that the popup 'asks' the content script on the page for the data. This increases performance, because the extension only reloads when necessary. What photos would you like? - There are no errors in console.

[gobbledy-gook]

@Aarav-Juneja good update guys ! I have reviewed it and works fine.

For some reason it does show some error for anonymous asyn function that has been used in popup.js. Here is a screenshot of this error. @AnsahMohammad any inputs on this error ?