Move 3rd party js/css into public/vendor and document sources (#2383)

This commit cherry picks the following commits (master -> v1.2):
  a915a09
  874f9be
  233bbcf

Ref: https://github.com/go-gitea/gitea/issues/1484
Signed-off-by: Michael Lustfield <michael@lustfield.net>

public/vendor/plugins/autolink/LICENSE

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2015 egoist 0x142857@gmail.com
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

public/vendor/plugins/autolink/autolink.js

@@ -0,0 +1,45 @@
+(function () {
+    var re = /((([A-Za-z]{3,9}:(?:\/\/)?)(?:[\-;:&=\+\$,\w]+@)?[A-Za-z0-9\.\-]+|(?:www\.|[\-;:&=\+\$,\w]+@)[A-Za-z0-9\.\-]+)((?:\/[\+~%\/\.\w\-]*)?\??(?:[\-\+:=&;%@\.\w]*)#?(?:[\.\!\/\\\w]*))?)/g;
+    function textNodesUnder(node) {
+        var textNodes = [];
+        if(typeof document.createTreeWalker === 'function') {
+            // Efficient TreeWalker
+            var currentNode, walker;
+            walker = document.createTreeWalker(node, NodeFilter.SHOW_TEXT, null, false);
+            while(currentNode = walker.nextNode()) {
+                textNodes.push(currentNode);
+            }
+        } else {
+            // Less efficient recursive function
+            for(node = node.firstChild; node; node = node.nextSibling) {
+                if(node.nodeType === 3) {
+                    textNodes.push(node);
+                } else {
+                    textNodes = textNodes.concat(textNodesUnder(node));
+                }
+            }
+        }
+        return textNodes;
+    }
+
+    function processNode(node) {
+        re.lastIndex = 0;
+        var results = re.exec(node.textContent);
+        if(results !== null) {
+            if($(node).parents().filter('pre>code').length === 0) {
+                $(node).replaceWith(
+                    $('<span />').html(
+                        node.nodeValue.replace(re, '<a href="$1">$1</a>')
+                    )
+                );
+            }
+        }
+    }
+
+    jQuery.fn.autolink = function () {
+        this.each(function () {
+            textNodesUnder(this).forEach(processNode);
+        });
+        return this;
+    };
+})();