Docs are incomplete when using Netlify for auth but not hosting (using Github Backend)

[daniel-keller]

Decap CMS docs provide instructions for setting up the Github backend and explains why a netlify site, even if unused for hosting, is necessary for authentication. When providing instructions for this setup the docs direct devs to the Netlify docs (paragraph 3, step 1.). The Netlify docs assume Netlify is the hosting service and so a crucial step is not provided to devs who want to host their site on Github Pages (and I assume other services but I haven't confirmed this) but use Netlify for auth services.

The missing steps are as follows:

1. Change the CMS site_domain configuration to the domain of the Netlify dummy site
2. Register your Github Pages' site domain name within Netlify's "Domain Management" settings.

Without these steps your login into Decap on your Github Pages site will result in a "Not Found" message.

Sources are the Netlify Discord and this blog post

Could you update the docs to include these steps?

[martinjagodic]

@daniel-keller are you willing to contribute the missing steps as a PR? It would be much appreciated 🙏