refine style and chart

[cnell-usgs]

Changes made:

Adds a few more charts and alt text to each chart. Links charts to twitter or drupal where they were shared. makes links less prominent and tries to make style of headers consistent across sections. Populates about section with starter info.

Testing:

Before making this pull request, I:

• [ ] Cleaned the code the way Vue likes it - run 'npm run lint --fix'
• [ ] Made sure all tests run
• [ ] Ran WAVE plugin 508 compliance tool

I can confirm this has been checked on:

• [ ] Chrome
• [ ] Safari
• [ ] Edge
• [ ] Firefox
• [ ] Samsung Internet
• [ ] Internet Explorer 11 (not supported, but still needs at least a working user redirect page)

[cnell-usgs]

Minor changes, going to merge to put up on test.