make text smaller with font overrides in main.scss (#30)

- [x] add main.scss
- [x] set font defaults to smaller values

Author: tgamblin

assets/css/main.scss

@@ -0,0 +1,21 @@
+---
+# upgrade-friendly font size adjustment for Minimal Mistakes
+# see https://github.com/mmistakes/minimal-mistakes/issues/1219
+---
+@import "minimal-mistakes";
+
+html {
+  font-size: 14px; // change to whatever
+
+  @include breakpoint($medium) {
+    font-size: 14px; // change to whatever
+  }
+
+  @include breakpoint($large) {
+    font-size: 16px; // change to whatever
+  }
+
+  @include breakpoint($x-large) {
+    font-size: 18px; // change to whatever
+  }
+}