Update AwkwardForth documentation and move it from the wiki to the standard docs.

[jpivarski]

This also removes the excessive (and useless) list of functions from hidden modules in the left-bar.

[jpivarski]

AwkwardForth undocumented features to document before merging:

• case
• enum
• peek
• skipws
• printing strings
• printing the stack

[codecov]

Codecov Report

Merging #1422 (400eeb3) into main (edfce38) will decrease coverage by 0.02%.
The diff coverage is 43.24%.

Impacted Files	Coverage Δ
src/awkward/_v2/_connect/cuda/__init__.py	0.00% <0.00%> (ø)
src/awkward/_v2/_connect/jax/__init__.py	0.00% <0.00%> (ø)
src/awkward/_v2/contents/indexedarray.py	62.32% <0.00%> (+0.43%)	⬆️
src/awkward/_v2/operations/convert/ak_from_cupy.py	50.00% <0.00%> (+23.33%)	⬆️
src/awkward/_v2/operations/convert/ak_from_jax.py	50.00% <0.00%> (-25.00%)	⬇️
src/awkward/_v2/operations/convert/ak_to_cupy.py	33.33% <0.00%> (+23.95%)	⬆️
src/awkward/_v2/operations/convert/ak_to_jax.py	33.33% <0.00%> (-41.67%)	⬇️
src/awkward/_v2/operations/describe/ak_backend.py	10.00% <0.00%> (-2.50%)	⬇️
src/awkward/_v2/_util.py	75.26% <37.06%> (-8.07%)	⬇️
src/awkward/_v2/contents/numpyarray.py	90.42% <50.00%> (-0.15%)	⬇️
... and 21 more