Change webapp url paths

Don't use `#`, because many people find it awkward. Now "normal" urls
are used and elm takes care to not issue a server request when these
change.

modules/microsite/src/main/resources/microsite/css/docspell.css

@@ -25,3 +25,7 @@
 .docs h4 {
     text-decoration: underline;
 }
+
+.docs .thumbnail img {
+    width: 100%;
+}