Couple of small Volcano plugins

@Razum This is amazing, thank you so much for building this

I love the fullscreen plugin. I just created an issue on github as a feature request

to work similarly to Collapsible Side bar from Meta Post - Common CSS Hacks

I thought it be better to write that out on github, but feel free to let me know if you prefer me to be more specific on this forum, or if github is fine

Thank you!