Zimbabwe: replace 'Mzalendo' or 'Mzalendo Zimbabwe' with 'Kuvakazim'
Ignore more config files.

Anyone using bin/switch_country.py to manage several different
Mzalendo setups is going to have an assortment of config files
general-*.yml.

We may as well exclude them all from git.
Change overview to have correct suffix
Zimbabwe: update with logo and colours from Peter Teuben

These changes are just to make the logo and colours match
the Kuvakazim site here: http://carma.astro.umd.edu/ztest/

The logo was provided by Peter Teuben.
Merge branch 'zimbabwe'
Merge remote-tracking branch 'origin/master' into production