Make a clean README.md

[cleveHEX]

Current situation is not ideal, README.md is too bloated and the platform is hard to maintain.

[JarekParal]

I'm not sure that the README.md was too bloated.

But now I have a problem with the clarity of the Pinout wiki. The previous style was better for me in README.md.

[cleveHEX]

README files are not meant to cover whole docs.

[JarekParal]

Yes, but the Pinout wiki isn't simple enough for beginners.
The previous style in README.md was, in my opinion, better for beginners.

[cleveHEX]

I do not see how the README.md version is simpler, the one in wiki looks better. Also it is better to not have the same stuff on zillion places, because it is hard to maintain.

[JarekParal]

I don't know but the left side is more readable and clear in my opinion (especially for beginners):

[cednik]

I agree with @JarekParal - left side is better (especially for begginers).
To wiki version: I think, that the left-most column Pin is redundant and maybe confusing. Dn is Arduino only pin marking and therefore it is in Arduino column. On ESP32 this is completly irrelevant.