➕ (markdown) add markdown footnote

package.json

@@ -20,6 +20,7 @@
     "markdown-it": "^12.0.6",
     "markdown-it-block-embed": "^0.0.3",
     "markdown-it-checkbox": "^1.1.0",
+    "markdown-it-footnote": "^3.0.3",
     "markdown-it-svg-code-copy": "^1.0.0",
     "nanoid": "^3.1.23",
     "notyf": "^3.9.0",

src/shims-vue.d.ts

@@ -7,3 +7,4 @@ declare module 'pouchdb-adapter-indexeddb'
 declare module '@toycode/markdown-it-class'
 declare module 'markdown-it-block-embed'
 declare module 'markdown-it-checkbox'
+declare module 'markdown-it-footnote'

yarn.lock

@@ -7851,6 +7851,11 @@ markdown-it-checkbox@^1.1.0:
   dependencies:
     underscore "^1.8.2"
 
+markdown-it-footnote@^3.0.3:
+  version "3.0.3"
+  resolved "https://registry.yarnpkg.com/markdown-it-footnote/-/markdown-it-footnote-3.0.3.tgz#e0e4c0d67390a4c5f0c75f73be605c7c190ca4d8"
+  integrity sha512-YZMSuCGVZAjzKMn+xqIco9d1cLGxbELHZ9do/TSYVzraooV8ypsppKNmUJ0fVH5ljkCInQAtFpm8Rb3eXSrt5w==
+
 markdown-it-svg-code-copy@^1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/markdown-it-svg-code-copy/-/markdown-it-svg-code-copy-1.0.0.tgz#a895d836f0667c7ac211d867208aff16f182dc2d"