esp32/README: Update the README details to account for newer chips.

Noted while adding C2 support that some of these comments are a bit out of
date. Spun out to its own commit, and also mention C5 as well.

This change also adds some recommendation on which ESP32 board to pick, as
we occasionally see issues or questions that would be non-issues on a board
with more RAM (and for small production or personal projects the savings of
picking a cheaper ESP32 chip are basically neglible).

This work was funded through GitHub Sponsors.

Signed-off-by: Angus Gratton <angus@redyak.com.au>

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