Docs/variables data (#1314)

* Replace variables.json with colors.json and update related files accordingly

* Add variables data files

* Update variables include template and all related files to use new variables data

* Fix mobile breakpoint id typo in responsivness docs page

* Fix Liquid syntax error in made-with-bulma docs page

* Update bulma sass files count in modular docs page

* Use breakpoints data in responsiveness helpers docs page

* Use breakpoints and variables data in typography helpers docs page

* Add missing page titles in docs pages front matter

docs/_data/variables/utilities/controls.json

@@ -0,0 +1,30 @@
+{
+  "dir_name": "utilities",
+  "file_name": "controls",
+  "file_relative_path": "utilities/controls.sass",
+  "file_line_from": 1,
+  "file_line_to": 5,
+  "file_url": "https://github.com/jgthms/bulma/blob/master/sass/utilities/controls.sass#L1,L5",
+  "vars": {
+    "control-radius": {
+      "id": "control-radius",
+      "name": "$control-radius",
+      "value": "$radius"
+    },
+    "control-radius-small": {
+      "id": "control-radius-small",
+      "name": "$control-radius-small",
+      "value": "$radius-small"
+    },
+    "control-padding-vertical": {
+      "id": "control-padding-vertical",
+      "name": "$control-padding-vertical",
+      "value": "calc(0.375em - 1px)"
+    },
+    "control-padding-horizontal": {
+      "id": "control-padding-horizontal",
+      "name": "$control-padding-horizontal",
+      "value": "calc(0.625em - 1px)"
+    }
+  }
+}