fix: allow also " inside of an embed

Author: luwol03

Diff for: docs/embed-files.md

@@ -16,7 +16,7 @@ Then the content of `example.md` will be displayed directly here;
 
 You can check the original content for [example.md](_media/example.md ':ignore').
 
-Normally, this will compiled into a link, but in docsify, if you add `:include` it will be embedded.
+Normally, this will compiled into a link, but in docsify, if you add `:include` it will be embedded. You can use single or double quotation marks around as you like.
 
 External links can be used too - just replace the target. If you want to use a gist URL, see [Embed a gist](#embed-a-gist) section.
 

Diff for: src/core/render/utils.js

@@ -23,8 +23,8 @@ export function getAndRemoveConfig(str = '') {
 
   if (str) {
     str = str
-      .replace(/^'/, '')
-      .replace(/'$/, '')
+      .replace(/^('|")/, '')
+      .replace(/('|")$/, '')
       .replace(/(?:^|\s):([\w-]+:?)=?([\w-%]+)?/g, (m, key, value) => {
         if (key.indexOf(':') === -1) {
           config[key] = (value && value.replace(/"/g, '')) || true;