I'm doing this separately from removing the explorer/ and installers/
directories so that it's easier to review the side-effects.
Note for the main README, I didn't think it was worth keeping a mention
of "used to have a prototype interpreter, now archived" versus focusing
on the existing toolchain (for "Currently, we have fleshed out").
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Co-authored-by: Richard Smith <richard@metafoo.co.uk>
The original header was exactly 80-columns which made every file format
with a line-start comment syntax reflow the text. Instead, pick
a canonical re-flowing that keeps it to just three lines. This also lets
the text refer to the project which seems more clear.
No practical or semantic change here, just getting consistent wording
and line breaks for regularity.