Balance out the 'try it' and 'see it' blocks

see gh-1636.

Just noodling a bit, threw in some more copy to try and flesh it
out a little and let the reader know what they are in for.
Cut down verbosity on 'see it' marketing paragraph

The 'rinse and repeat' was a bit much.
Tweak the vertical alignment on img in footer
Switch back to the centered simpler 'try it' block
Merge pull request #1640 from bemurphy/bem-footer_img_alignment

Tweak the vertical alignment on img in footer
Try out a different breakdown of no-nits exercises
Merge pull request #1639 from bemurphy/bem-1636_see_it_cleanup

Balance out the 'try it' and 'see it' blocks
Merge pull request #1644 from jbcden/update_dependencies

updated dependencies
Require haml explicitly
Add migration for lifecycle events
Delete deprecated endpoint.
Tweak for bugsnag
Track lifecycle events
Add index to lifecycle table
Unify event names
Create migration script for lifecycle events
Avoid nil error in iterations endpoint