pidgin/pidgin

Update all of the development documentation

2021-01-18, Gary Kramlich
7a4e48594a24
Update all of the development documentation

Add documentation for using our repos and how to contribute to them.

Testing Done:
Built the docs locally and verified they look decent.

Reviewed at https://reviews.imfreedom.org/r/404/
subdir('libpurple')
subdir('protocols')
if ENABLE_GTK
subdir('pidgin')
else
pidgin_doc = []
endif
if enable_consoleui
subdir('finch')
else
finch_doc = []
endif
alias_target('doc', libpurple_doc, protocols_doc, pidgin_doc, finch_doc)