Editor tweaks

[aodhfionn]

• Make it so that when you close the editor and there is no content it deletes the content block
• Implement editing headers (should be more restrictive than text block)
• I think there's some indentation and padding issues not completely sure
• Font size changes when entering the editor
• Add different header size buttons to toolbar

If there's anything else that you guys want to be changed about the editor leave a comment

[vimpro]

Some minor UI/UX stuff:

• add a hoverable tooltip for each editor function (could literally just be an alt tag)
• make it more obvious when an editor function is toggled (currently the button becomes slightly brighter but it is hard to tell)
• When the page loads, don't show the editor box. the user should add a new text block first
• i like that when you hover over a block, it shows a vague outline. we should extend this so that there is always some sort of distinction between blocks (not really editor-specific but nonetheless)
• similarly, have a delete block button to the side when hovering over a block. like a little grey trashcan when hovered and then make it red if that element is currently selected
• switching between code/non-code mode is a little weird. it seems to change the whole block's formatting?

[vimpro]

Also make it more obvious when a header is being edited (change the background color or similar)

[vimpro]

actually i can do this