microbit: theming for cloud projects card (#5044)

.vscode/settings.json

@@ -1,6 +1,6 @@
 // Place your settings in this file to overwrite default and user settings.
 {
-    "files.autoSave": "afterDelay",
+    "files.autoSave": "off",
     "files.watcherExclude": {
         "**/.git/objects/**": true,
         "**/built/**": true,

theme/site/globals/site.variables

@@ -53,6 +53,7 @@
 @simulatorBackground: #FDFDFF;
 @editorToolsBackground: @simulatorBackground;
 @blocklySvgColor: #ecf0f1;
+@cloudCardBackground: lighten(@blue, 9);
 
 /*-------------------
    Side Docs