Editable embeds

[Allberg]

Both blocks and pages at it's current stage aren't editable. I'm not sure if this is a major challenge, but would enable much richer usage of this world-leading knowledge management tool!

[tiensonqin]

Embeds for blocks and pages were supported before, I'll fix this soon.

[tiensonqin]

Should be fixed now, lmk if it doesn't work for you.