Revert/empty placeholder

[youknowriad]

revert #3623

This will give us more time to work on the "Empty Placeholder"

[jasmussen]

😭

I'm going to miss this. Honestly, the "below the block list" chrome feels a bit heavy in comparison. I look forward to if/when we can revisit this.

For now this works well for me, thank you as usual Riad, 👍 👍

[codecov]

Codecov Report

Merging #3650 into master will decrease coverage by 0.03%.
The diff coverage is 93.33%.

@@            Coverage Diff             @@
##           master    #3650      +/-   ##
==========================================
- Coverage   37.07%   37.03%   -0.04%     
==========================================
  Files         276      277       +1     
  Lines        6656     6763     +107     
  Branches     1211     1230      +19     
==========================================
+ Hits         2468     2505      +37     
- Misses       3530     3585      +55     
- Partials      658      673      +15

Impacted Files	Coverage Δ
editor/store-defaults.js	100% <ø> (ø)	⬆️
editor/edit-post/modes/visual-editor/index.js	0% <0%> (ø)	⬆️
editor/reducer.js	90.27% <100%> (+0.27%)	⬆️
editor/selectors.js	93.12% <100%> (+0.26%)	⬆️
editor/components/default-block-appender/index.js	88.88% <100%> (+1.38%)	⬆️
editor/edit-post/modes/visual-editor/inserter.js	93.33% <93.33%> (ø)
blocks/library/button/index.js	11.59% <0%> (-3.12%)	⬇️
blocks/library/image/block.js	1.28% <0%> (-0.45%)	⬇️
blocks/library/paragraph/index.js	25.8% <0%> (+2.72%)	⬆️

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[youknowriad]

Don't worry @jasmussen I'll bring it back when I have some time