Publish post 'Test nginx Configuration Directives' (#3)

Sitegen had some problems rendering `$host$request_uri` and `$$ct` so I had to make some changes to the Markdown renderer.

Reviewed-on: #3

spec/nginx_spec.moon

@@ -104,6 +104,10 @@ describe "https://miti.sh/posts/", ->
 
 describe "https://miti.sh/posts", ->
   it "sends /posts/index.html", ->
+    with require "sitegen.path"
+      assert .exists("html/posts/index.html"),
+        "missing html/posts/index.html (try `make build file=blog.html`)"
+
     request = req "https://miti.sh/posts"
     assert.same request\statusCode!, 200
     assert.same request\statusMessage!, "OK"