Remove lifegroups-3

Page LifeGroups-3 has yet to receive authentic photography for the
quotes. Remove the page and widen the other tiles to 50%.

Changes to be committed:
modified:   pages/lifegroups-2.html
deleted:    pages/lifegroups-3.html
modified:   pages/lifegroups-4.html
modified:   pages/lifegroups.html
new file:   redirects/lifegroups-3.html
modified:   scss/pages/_lifegroups.scss
modified:   stylesheets/app.css
Merge branch 'master' of github.com:lifechurch/lifechurch-site