Add subset of STIX, update changes in css

app/static/style.css

@@ -1,8 +1,7 @@
 @font-face
 {
     font-family: STIX;
-    src: url("http://127.0.0.1:5000/static/STIX2Text-Regular.woff") format("woff"), 
-         url("http://127.0.0.1:5000/static/STIX2Text-Regular.otf") format("truetype");
+    src: url("http://127.0.0.1:5000/static/STIX2Text-Regular.subset.otf") format("truetype");
 }
 
 body