Add Additional Sections & Scrolling to Insertion Block about gutenberg

[jasmussen]

Here's the latest mockup:

https://github.com/WordPress/gutenberg/blob/5e50c86e0c5c53cd2245e92537e8931cdc0cb317/mockups/Insert.png

See also this comment.

For some background on how this could work:

• As you are writing, typing typing typing, the plus button is below the last paragraph. As you make a linebreak, the plus moves to the side, see #72.
• When on a new line, the inserter can be invoked by pressing the shortcut key /. See #24 and #71.
• When the inserter is invoked, you can immediately use the arrow keys to select a block, and use Enter to insert that block. OR: you could start typing, at which point you'd start searching through the blocks.

So these flows should work:

• Type text, press enter for new line, type /, use arrow keys to select image, press enter, image is inserted
• Click plus with mouse, start typing ima and Image would quickly be filtered as the top result, press Enter, image is inserted

[karmatosed]

This is making me very excited about how the interface will feel magic. Having it adapt and know what you want to use, to predict - that's going to be super powerful to users.

[jasmussen]

Closing this in favor of #34