Add unique secret keys.
Add custom favicon.
Add backup plugins.
Add Jetpack plugin.
Add newer official themes.
Remove Jepack.
Remove backup plugins.
Add Git submodules.
Add gallery plugins.
Use HTTPS for submodules to prevent Heroku authentication failure.
Fix submodule URLs.
Add Erdem sub-theme.
Remove plugins and add as sub-modules.
Add acf-gallery plugin.