Delete leftovers of the `crypt-auth` `./configure` option and
add the new ones that replaced them.
Follow-up to e92edfbef64448ef461117769881f3ed776dec4e #11490
Reviewed-by: Daniel Stenberg
Closes#12194
you will find a mix of various documentation in this directory and
subdirectories, using several different formats. Some of them are not ideal
for reading directly in your browser.
If you would rather see the rendered version of the documentation, check out the
curl website's documentation section for
general curl stuff or the libcurl section for
libcurl related documentation.