Fix two typos in test descriptions

(noticed these when copying the tests over to finder-frontend)
Remove references to static in tests

- static.preview.alphagov.co.uk points to an IP that should not be
  publicly available and we will remove.
- assets-origin.preview.alphagov.co.uk points to an IP that is publicly
  available and will remain.

In order that the tests succeed when this DNS/IP is removed, we need to
update the tests.
Fix jobsearch input field formatting

- The input field css was not being applied on the jobsearch page.
- Split out .jobsearch-form css into separate file.
Merge pull request #647 from alphagov/remove-static-from-tests

Remove references to static in tests
Merge pull request #648 from alphagov/jobsearch-input-field-layout-fix

Fix jobsearch input field formatting
The comment tag in ERB is `<%#`

http://apidock.com/ruby/ERB

The space in this line raises a syntax error when copied to the live page.
Make other comments consitent to avoid confusion

As noted in the previous commit, the comment tag for ERB is `<%#`. These lines
work as comments because they are the first thing in the file; however, correcting
them to avoid confusion.
Merge pull request #649 from alphagov/fix-notifications

Correct ERB comment tag
Homepage content update
- Promo-image section update
- Rename the css class data to a more generic 'promo-main-text'
Merge pull request #651 from alphagov/homepage_update_1august

Homepage content update