Fix documentation links

docs/_data/links.json

@@ -31,7 +31,7 @@
       "path": "/documentation/overview/customize"
     },
     "overview-classes": {
-      "name": "Classes",
+      "name": "CSS classes",
       "subtitle": "Bulma is simply a <strong>collection</strong> of CSS classes. Write the HTML code you want.",
       "color": "link",
       "icon_brand": "true",
@@ -132,12 +132,12 @@
       "icon": "cogs",
       "path": "/documentation/modifiers"
     },
-    "modifiers-syntax": {
-      "name": "Syntax",
+    "overview-modifiers": {
+      "name": "Modifiers syntax",
       "subtitle": "Most Bulma elements have <strong>alternative</strong> styles. To apply them, you only need to append one of the <strong>modifier classes</strong>. They all start with <code>is-</code> or <code>has-</code>.",
       "color": "orange",
       "icon": "code",
-      "path": "/documentation/modifiers/syntax"
+      "path": "/documentation/overview/modifiers"
     },
     "modifiers-helpers": {
       "name": "Helpers",
@@ -268,37 +268,44 @@
     "layout-container": {
       "name": "Container",
       "subtitle": "A simple <strong>container</strong> to center your content horizontally",
-      "path": "/documentation/layout/container"
+      "path": "/documentation/layout/container",
+      "icon": "arrows-alt-h"
     },
     "layout-level": {
       "name": "Level",
       "subtitle": "A multi-purpose <strong>horizontal level</strong>, which can contain almost any other element",
-      "path": "/documentation/layout/level"
+      "path": "/documentation/layout/level",
+      "icon": "ruler-horizontal"
     },
     "layout-media": {
       "name": "Media Object",
       "subtitle": "The famous <strong>media object</strong> prevalent in social media interfaces, but useful in any context",
-      "path": "/documentation/layout/media-object"
+      "path": "/documentation/layout/media-object",
+      "icon": "th-list"
     },
     "layout-hero": {
       "name": "Hero",
       "subtitle": "An imposing <strong>hero banner</strong> to showcase something",
-      "path": "/documentation/layout/hero"
+      "path": "/documentation/layout/hero",
+      "icon": "star"
     },
     "layout-section": {
       "name": "Section",
       "subtitle": "A simple container to divide your page into <strong>sections</strong>, like the one you're currently reading",
-      "path": "/documentation/layout/section"
+      "path": "/documentation/layout/section",
+      "icon": "square"
     },
     "layout-footer": {
       "name": "Footer",
       "subtitle": "A simple responsive <strong>footer</strong> which can include anything: lists, headings, columns, icons, buttons, etc.",
-      "path": "/documentation/layout/footer"
+      "path": "/documentation/layout/footer",
+      "icon": "window-minimize"
     },
     "layout-tiles": {
       "name": "Tiles",
       "subtitle": "A <strong>single tile</strong> element to build 2-dimensional Metro-like, Pinterest-like, or whatever-you-like grids",
-      "path": "/documentation/layout/tiles"
+      "path": "/documentation/layout/tiles",
+      "icon": "th"
     },
     "form": {
       "name": "Form",
@@ -620,9 +627,8 @@
     "bulma-start"
   ],
   "categories": {
-    "overview": ["overview-start", "overview-classes", "overview-modular", "overview-responsiveness", "overview-colors", "overview-functions", "overview-mixins"],
+    "overview": ["overview-start", "overview-classes", "overview-modifiers", "overview-modular", "overview-responsiveness", "overview-colors", "overview-functions", "overview-mixins"],
     "customize": ["customize-concepts", "customize-variables", "customize-node-sass", "customize-sass-cli", "customize-webpack"],
-    "modifiers": ["modifiers-syntax", "modifiers-helpers", "modifiers-responsive-helpers", "modifiers-color-helpers", "modifiers-typography-helpers"],
     "helpers": ["helpers-color", "helpers-spacing", "helpers-typography", "helpers-visibility", "helpers-other"],
     "columns": ["columns-basics", "columns-sizes", "columns-responsiveness", "columns-nesting", "columns-gap", "columns-options"],
     "layout": ["layout-container", "layout-level", "layout-media", "layout-hero", "layout-section", "layout-footer", "layout-tiles"],