Remove most Netlify configuration

[backspace]

This removes the in-repository Netlify configuration. There are now two
sites backed by the repository, so we must now use the web UI to
control the build settings, as having the configuration in-repository
overrides the web UI settings.

The build settings for the two sites are below, as of this commit. See
the extra step in nomad-ui site’s build step that copies the _redirects
file to the correct destination so things are properly forwarded when
you visit the deployment.

nomad-ui:

base directory: ui
build command: ember build && mkdir -p ui-dist/ui && mv dist/* ui-dist/ui/ && cp ../.netlify/ui-redirects ui-dist/_redirects
publish directory: ui/ui-dist

nomad-website:

base directory: website
build command: bundle exec middleman build
publish directory: website/build

[DingoEatingFuzz]

Looks good!

I kicked the tires on both Netlify checks and it worked as advertised.

[github-actions]

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