Update templates to remove warning messages when app is compiled

[RobStallion]

When the app is first compiled there are a lot of warning messages that come up for unexpected = signs in the templates.

Go through and update where necessary.

This is not going to prevent that app from running but is not best practice so would be good to fix.

[RobStallion]

Plug.MIME.type/1 is deprecated, please use MIME.type/1 instead

Resolving this as part of this issue

[RobStallion]

fix here