About tab

This is my work on the new About tab of the UI.  <a href="https://docs.google.com/drawings/d/1Y7jjzA9VmcNwwB9G8BcJ0WMrRwSbXVoDG5FNPMPKIO4/edit?usp=sharing">Prototype</a>

<b>To Do</b>
- [x] Freeseer description and image
- [x] Buttons
- [ ] Button functionality
- [ ] Make image have a clear background (feasibility?)
- [ ] Version
- [ ] Copyright
- [ ] Licence
- [ ] Freeseer made possible by ...
- [ ] Translations for page
- [ ] Squash commits
- [ ] Nice commit message