Bundle and use Inconsolata v2.012

There's a newer version of the font available but ligatures seem
broken googlefonts/Inconsolata#58 and googlefonts/Inconsolata#52.

As part of this commit I also upgraded rust-embed to use the new
exclusion feature, which allows us to skip embedding OS files like
`.DS_Store`.

server/src/assets.rs

@@ -26,6 +26,6 @@ async fn get_static_asset(request: Request) -> tide::Result {
 
     Ok(tide::Response::builder(200)
         .content_type(content_type)
-        .body(content.as_ref())
+        .body(content.data.as_ref())
         .build())
 }

server/src/main.rs

@@ -83,7 +83,7 @@ impl AppState {
                 let partial = Templates::get(path.as_ref()).unwrap();
                 self.handlebars
                     .write()
-                    .register_partial(partial_name, std::str::from_utf8(partial.as_ref()).unwrap())
+                    .register_partial(partial_name, std::str::from_utf8(&partial.data).unwrap())
                     .unwrap()
             }
         }
@@ -98,7 +98,7 @@ impl AppState {
         self.register_partials();
 
         self.handlebars.read().render_template(
-            std::str::from_utf8(Templates::get(path).unwrap().as_ref()).unwrap(),
+            std::str::from_utf8(&Templates::get(path).unwrap().data).unwrap(),
             data,
         )
     }