change font-size for editor

apps/app/src/components/PageEditor/CodeMirrorEditor.module.scss

@@ -13,6 +13,7 @@
 
   .CodeMirror {
     font-family: var(--font-family-monospace);
+    font-size: 15px;
 
     pre.CodeMirror-line.grw-cm-header-line {
       padding-top: 0.16em;