Add link to GitHub on options page

**Is your feature request related to a problem? Please describe.**
I can't find a GitHub link to the project on the options' page, so I have to search it in Chrome Store description or in Google.

**Describe the solution you'd like**
Add a link to GitHub on the options' page

**Describe alternatives you've considered**

**Additional context**

Start by locating the browser extension's options page and its UI entry point, then inspect how links are currently rendered there. Add a visible link to the project's GitHub page and verify it appears on the options page and opens the intended repository.

Written by the indexing model from the issue text.