Add documentation icons

docs/_data/icons.json

@@ -1,6 +1,6 @@
 {
   "fontawesome4": "https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css",
-  "fontawesome5": "https://use.fontawesome.com/releases/v5.0.6/js/all.js",
+  "fontawesome5": "https://use.fontawesome.com/releases/v5.0.7/js/all.js",
   "iconic": "https://cdnjs.cloudflare.com/ajax/libs/open-iconic/1.1.1/font/css/open-iconic.min.css",
   "ionicons": "https://code.ionicframework.com/ionicons/2.0.1/css/ionicons.min.css",
   "mdi": "https://cdn.materialdesignicons.com/2.1.19/css/materialdesignicons.min.css"

docs/_data/links.json

@@ -12,6 +12,8 @@
     "overview": {
       "name": "Overview",
       "subtitle": "An overview of what Bulma as a <strong>framework</strong> is all about",
+      "color": "primary",
+      "icon": "eye",
       "path": "/documentation/overview"
     },
     "overview-start": {
@@ -62,6 +64,8 @@
     "modifiers": {
       "name": "Modifiers",
       "subtitle": "An <strong>easy-to-read</strong> naming system designed for humans",
+      "color": "info",
+      "icon": "cogs",
       "path": "/documentation/modifiers"
     },
     "modifiers-syntax": {
@@ -92,6 +96,8 @@
     "columns": {
       "name": "Columns",
       "subtitle": "The power of <strong>Flexbox</strong> in a simple interface",
+      "color": "star",
+      "icon": "columns",
       "path": "/documentation/columns"
     },
     "columns-basics": {
@@ -127,6 +133,8 @@
     "layout": {
       "name": "Layout",
       "subtitle": "Design the <strong>structure</strong> of your webpage with these CSS classes",
+      "color": "success",
+      "icon": "warehouse",
       "path": "/documentation/layout"
     },
     "layout-container": {
@@ -167,6 +175,9 @@
     "form": {
       "name": "Form",
       "subtitle": "The indispensable <strong>form controls</strong>, designed for maximum clarity",
+      "color": "link",
+      "icon_brand": "true",
+      "icon": "wpforms",
       "path": "/documentation/form"
     },
     "form-general": {
@@ -207,6 +218,8 @@
     "elements": {
       "name": "Elements",
       "subtitle": "Essential interface elements that only require a <strong>single CSS class</strong>",
+      "color": "orange",
+      "icon": "cube",
       "path": "/documentation/elements"
     },
     "elements-box": {
@@ -267,6 +280,8 @@
     "components": {
       "name": "Components",
       "subtitle": "Advanced multi-part components with lots of possibilities",
+      "color": "danger",
+      "icon": "cubes",
       "path": "/documentation/components"
     },
     "components-breadcrumb": {