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Uses silence mode of curl for better autocomplete.
Co-authored-by: Dominik Rimpf <dev@d-rimpf.de>

Deals with app error page, saving true error instead.

Upon app failure, Heroku returns HTML "Application Error" page.
Finding HTML page in .gitignore is confusing, so I replaced
`-s` with `-f` in curl calls, which cuts such output.

Replace instead of addition as no progress meter outputs either.

It is practically impossible to teach good programming style to students that have had prior exposure to BASIC.  As potential programmers, they are mentally mutilated beyond hope of regeneration.
      -- E. W. Dijkstra

Seems like this is more like the intended effect, splits arguments with commas
for proper gitignore.io api request.
Thanks for teaching me about custom compdef completions!

Updated with zsh join operator by Marc Cornellà

This commit completes previous efforts and standardizes both curl commands
into using silent mode and following redirects in case the URL changes
again in the future.

github.io moved to https and http returns 301 redirect

Fix URL to gi (gitignore) function in _gitignireio_get_command_list function

Previous URL doesn't seem to work because the host requires a www
prefix.