office: Rename mail module to office module

Reflecting the somewhat expanding scope of the module, renamed it to
office. Still keeps the old files and setups but also got a new README
file.

office/.local/bin/render-prettyhtml

@@ -0,0 +1,6 @@
+#!/usr/bin/env bash
+# render html as markdown and display in glow, supports syntax highlighting
+# requires: html2text, glow
+# author: CEUK
+perl -0777pe 's/(<code class="sourceCode\s?)(\w+?)(">)(.*?)(<\/code>)/\1\2\3\n```\2\n\4\n```\n\5/gs' "$1" | html2text | sed -re 's/^\s+(```(\w+)?)/\1/gm' >/tmp/mutt.md
+glow -s ~/.config/glow/email.json /tmp/mutt.md | sed 's/\x1b\[[6-9;]*m//g'