Replace banner

Corrects spelling mistake per #48
Replace banner

Issue #48

- Replace and delete /img/cp-logo-text-3.jp2 because it wasn't displaying in
  Firefox or Chrome.

- Delete unused images
Set language

Add lang = "en" to html tag
Modify Continue button

Issue #49

Removes "the Conversation" from the button
Update logo & add lang to html tag

Changes to support pages
- Updates logo to match index.html
- Sets language to english
Delete unused files

Removed
- thanks.html
- under-construction.html

because they were replaced with php counterparts.
Merge branch 'gh-pages'

Just catching master up with gh-pages