Merge back into Roam42

[dvargas92495]

This will be a tracker issue to make sure we cover all of the things before merging smartblocks V2 back into roam42. This will be done after release and will not be part of the project:

• Roam42 loads smartblocks script from RoamJS instead of from Roam42
• window.roam42.smartblocks globals functions point to window.roamjs.smartblocks globals
• Workbench <> Smartblocks - Nuke the idea of and be able to infer whether we need a block or not.
• Change default keystroke back to jj both in extension and in docs. uncomment 42setting
• Reinsert (42)? into button text regex
• Change roam42 docs to link straight to smartblocks extension and delete roam42/smartblocks pages