Merge pull request #144 from jlucido2/master

text changes, link changes and image changes
updated text above image slider and style on homepage
Updated text and style of content in welcome box on the science explorer.
Merge branch 'master' of https://github.com/jlucido2/glri-catalog into develop

* 'master' of https://github.com/jlucido2/glri-catalog:
  Update README.md
  Update README.md