docs: #pootle-dev IRC channel for developers
issues: add an issues quicklink and divert bugs

Divert bugs quicklink to githuv issues so that we don't have to rewrite
them all.
issues: remove bugday scripts

We haven't used these in ages and they rely on bugzilla to work.
issues: point to github issue numbers
issues: changes bugzilla reference to Github issues

And reword as needed
issues: correct bugnumber conflicts

Issues and PRs use the same number sequence.  Fix bug numbers that
migrated to a different issue number.
issues: adapt styleguide to use issues not bugs
issues: convert all :bug: to :issue:
issues: remove :bug: quicklink
docs: point python links to https