- Updated branding for admin and emails
- Updated crates and some deprications
- Removed newline-converter because this is built-in into lettre
- Updated email templates to use a shared header and footer template
- Also trigger SMTP SSL When TLS is selected without SSL
Resolves#1641
plain/text emails should not contain html elements like <p> <a> etc..
This triggers some spamfilters and increases the spam score.
Also added the github link into the text only emails since this also
triggers spamfilters to increase the score since the url/link count is
different between the multipart messages.
