add links to issues in overview

[evgeni]

No description provided.

[ekohl]

After merging this I looked at the result and wondered if we should say where it points to: GH or Redmine. Not sure if it helps, but noting it down here.

[evgeni]

you mean something like

Suggested change

	markdown_link('Issues', entry.issues_url),
	markdown_link('Redmine' if entry.redmine else 'GitHub', entry.issues_url),

or even further

def issues_link(issues_url):
  if 'github.com' in issues_url:
    issues_label = 'GitHub'
  elif 'projects.theforeman.org' in issues_url:
    issues_label = 'Redmine'
  else:
    issues_label = 'Issues'
  return markdown_link(issues_label, issues_url)

[evgeni]

#44