Modify compression scheme - no longer compressing index.html due to issues serving compressed file directly with .send on esp32

Removed css from compression plugin - using CSS-in-JS in app
Introduce favicon - add mapping for favicon.ico, was previously sending html response for requests for the favicon

src/main.cpp

@@ -51,6 +51,7 @@ void setup() {
     server.serveStatic("/css/", SPIFFS, "/www/css/");
     server.serveStatic("/fonts/", SPIFFS, "/www/fonts/");
     server.serveStatic("/app/", SPIFFS, "/www/app/");
+    server.serveStatic("/favicon.ico", SPIFFS, "/www/favicon.ico");
 
     // Serving all other get requests with "/www/index.htm"
     // OPTIONS get a straight up 200 response