Jira and enhanced source panel

You can now sync your Jira tickets with AskX, to ask on project status and updates.

This comes along a new experience of source management, letting you add and remove sources in bulk.

Other improvements

• @-mention a space to use it in seconds.
• New experience to report missing or incorrect answers, you can now comment, assign or dismiss in the flow of your question.
• Linear, github and Jira metadata are now indexed (You can ask "what's the status of this pull request?").