fix public post list filtering
fix use blog_user on public template
fix need to use blog_user for public page
update tags filtering functionality to allow for multiple tags to be filtered on
add all_tags lists to templates and postmanager functions to get all unique tags for posts and blog setting to show/hide tags in posts list
fix allow tags input on post form to be blank
add normalisetags management command
fix tags with hyphen not working on fitler
add blog setting for number of items to return in feed
add signup email notification to admin
add bold to username in dashboard welcome text
update dashboard to be workshop on the frontend
add dashboard welcome text
update style.css to be more like old literary
update wording for optional markdown editor auto formatting
update markdown auto formatter to include many more keyboard shortcuts
add new setting for auto markdown link formatting on paste in the editor
change error template wording and links