Background.js Refactor

[JordanRosas]

Refactored Background.js code using jQuery eliminating all instances of innerHTML.
issue number 12
Steps to test:

1. git fetch -A
2. git checkout jr-backgroundjs-refactor
3. Navigate to chrome://extensions and click the toggle to enter developer mode
4. click Load Unpacked the extension should load in your search bar
5. navigate to any website and copy the url
6. click on the Cookie-Manager icon and click Set Cookie
7. Fill out the small form by pasting the your URL into the Domain text box, give it a name, and a value
8. copy your url again and open the Cookie Manager extension
9. Paste your URL and click Display Cookies: you should see a table with the cookie you just saved for that URL
10. Click delete cookie and confirm that the text box clears and the total cookies number is set to 0

PS. Thank you for letting me work on this project. The more I got to click around and see what it actually does I thought I could be really beneficial. if there is anything you would like changes in this PR I would be happy to fix it!

[vinitshahdeo]

@JordanRosas Thanks for the PR.
You may look into a few good first issues which are up for grabs.

✅ Link to the repository