UX tweaks: Hide archived journals, more prominent delete, remove insert menu, block : in tags

[cloverich]

A few little issues / UX tweaks:

• Hide archived journals: By default, hide archived journals in the sidebar behind an accordion. I have numerous archived journals and don't need to see them all the time
• More prominent delete: Just colored it red and made it a trash icon; I got confused in Improve document deletion UX #192 because I already support this, so this was my cue that the UX is not very good. After thinking further on it, I need to incorporate delete into a context menu and make it work like other note taking applications
• Remove insert menu: There both an "Insert block" and a "Turn Into" dropdown; originally I needed the former, but now they work the same, and because of the logic that always ensures a trailing paragraph is present, there is always an existing block to turn into a new one. Its also obvious how to insert a paragraph, then change it into the block type you want. So I think insert is fully redundant, removing
• Prevent colons in tags: Replace : characters with _ because document searching relies on prefix: for faceting, and the logic isn't smart enough to handle e.g. tag:my:colon:containing:tag. For now I block it, but instead of stripping replace w/ a _ so its obvious its being changed by the system