Consider adding browser support for capturing pages (bookmarklet, right-click)

[siznax]

Improve ease of use for /capture by implementing a context menu (right-click dropdown) browser-extension.

Add selection to tanuki
Add page to tanuki

This should drop you into /edit_capture (as happens now) with the captured text so you can edit and save or dismiss.

[siznax]

It may make sense to also provide a bookmarklet for "Add page". What are the advantages/disadvantages of context menus versus bookmarklets?