Rearrange all the docs to allow for a docs/major.minor/ setup

docs/.htmlhintrc

@@ -1,17 +0,0 @@
-{
-  "alt-require": true,
-  "attr-lowercase": true,
-  "attr-no-duplication": true,
-  "attr-unsafe-chars": true,
-  "attr-value-double-quotes": true,
-  "doctype-first": true,
-  "doctype-html5": true,
-  "id-class-value": true,
-  "id-unique": true,
-  "space-tab-mixed-disabled": true,
-  "spec-char-escape": true,
-  "src-not-empty": true,
-  "tag-pair": true,
-  "tagname-lowercase": true,
-  "title-require": true
-}

docs/.htmllintrc

@@ -1,19 +0,0 @@
-{
-  "attr-bans": ["align", "background", "bgcolor", "border", "frameborder", "longdesc", "marginwidth", "marginheight", "scrolling"],
-  "attr-name-style": "dash",
-  "attr-no-unsafe-char": false,
-  "class-style": "dash",
-  "doctype-first": true,
-  "doctype-html5": true,
-  "fig-req-figcaption": false,
-  "html-valid-content-model": false,
-  "id-class-ignore-regex": "(onclick|content|[a-z]+([A-Z][a-z])+)",
-  "id-class-style": "dash",
-  "img-req-src": false,
-  "img-req-alt": false,
-  "indent-style": "spaces",
-  "indent-width": 2,
-  "spec-char-escape": false,
-  "tag-bans": ["b", "i"],
-  "title-max-len": false
-}

docs/4.0/getting-started/introduction.md

@@ -3,7 +3,10 @@ layout: docs
 title: Introduction
 description: Get started with Bootstrap, the world's most popular framework for building responsive, mobile-first sites, with the Bootstrap CDN and a template starter page.
 group: getting-started
-redirect_from: "/getting-started/"
+redirect_from:
+  - /getting-started/
+  - /docs/4.0/
+  - /docs/
 toc: true
 ---