Created org-protocol-templates.el

Removed all custom org-protocol templates from general-org.el. Finally
got org-protocol-capture-readability working appropriately. It now
works with a M-x call rather than being prompted by a protocol. For me,
this is currently faster because protocols don’t work.

Capture templates were updated to reflect the changes. All old
functions were kept, but they’ll eventually be deleted and replaced
with proper API calls.