Catch-all netlify redirects causes all 404 to be redirected to github.

[ludfjig]

Describe the bug

The /:version/* https://github.com/getporter/porter/releases/download/:version/:splat 302 redirect rule in our netlify _redirects file causes all web requests that would have been a 404 on our site, to instead be a 404 on github. This is annoying because there's no easy way to get back to the porter website from the github 404.

However, this redirection is used in our install.sh scripts, and are curled to download porter. So we cannot remove it without also changing our install script.

Ideally, we would just make the redirection less general, to only match something of the format "vX.Y.Z", but that seems impossible with netlify redirection syntax.

To Reproduce

go to any website that doesn't exist, and you'll be redirected to github instead, e.g https://getporter.org/idontexist

Expected behavior

We should get shown the porter 404 page, not the github one.