night.css: do not import default less theme statically

remove themes/default.php (not needed)
compact.css: fixes

themes/compact.less

@@ -0,0 +1,27 @@
+@import "../css/default.css";
+
+body.ttrss_main.ttrss_index.flat {
+
+  .dijitMenu .dijitMenuItemLabel,
+  .content-inner,
+  #content-insert,
+  .cdm .content,
+  .post .content {
+    font-size : 12px ! important;
+  }
+
+  div[id*=RROW] {
+    i {
+      font-size: 18px;
+    }
+  }
+
+  .hl,
+  .post .header .title,
+  #floatingTitle a.title,
+  .cdm .title {
+    font-size : 13px ! important;
+  }
+
+
+}