add notes about fonts

interface/public/css/roboto.css

@@ -1,15 +1,14 @@
-/* 
-* Just supporting latin due to size constrains on the esp chip 
-*
-* The framework only makes use of 400 (regular) weight fonts.
-*
-* If using medium (500), light or strong typography variants you will need to add additional fonts.
+/*
+* Uses font-size 400 (normal) only and Latin (plus extra unicode chars) to keep flash memory to a minimun
+* View fonts on https://fonts.google.com/
+* Download woff2 using e.g. https://fonts.googleapis.com/css2?family=Lato or https://fonts.googleapis.com/css2?family=Roboto
 */
 @font-face {
   font-family: 'Roboto';
   font-style: normal;
   font-weight: 400;
-  src: local('Roboto'), local('Roboto-Regular'), url(../fonts/re.woff2) format('woff2');
+  /* src: url(https://fonts.gstatic.com/s/roboto/v30/KFOmCnqEu92Fr1Mu4mxK.woff2) format('woff2'); */
+  src: local('Roboto'), local('Roboto-Regular'), url(../fonts/re.off2) format('woff2');
   unicode-range: U+0000-00FF, U+0104-0107, U+0118-0119, U+011E-011F, U+0130-0131, U+0141-0144, U+0152-0153, U+015A-015B,
     U+015E-015F, U+0179-017C, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+2000-206F, U+2074, U+20AC, U+2122, U+2191, U+2193,
     U+2212, U+2215, U+FEFF, U+FFFD;