Sort-out new deployment of docs.

Accessible at: https://railseventstore.netlify.com and soon under
https://railseventstore.org when DNS propagates.

Author: mostlyobvious

.gitignore

@@ -1,6 +1,8 @@
 .bundle/
 .yardoc
 .rspec_status
+.sass-cache/
+.cache/
 Gemfile.lock
 _yardoc/
 coverage/

netlify.toml

@@ -0,0 +1,4 @@
+[build]
+  base = "railseventstore.org/"
+  command = "middleman build"
+  publish = "railseventstore.org/build/"