fix use blog_user on public template
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 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
add pygments code block syntax highlighting
update wording on methodology page
change markdown library to markdown-it-python and add Graphviz support
change images to be assets and allow for more file types per #25
add new homepage content update page