Replace MaxCDN, which has shut down (#1904)

* Replace MaxCDN.

* Update expected HTML w/pygments installed.

Author: samdobson

docs/src/markdown/extensions/emoji.md

@@ -44,7 +44,7 @@ Emoji chooses to focus on three specific emoji sets:
     toolkit repo @JoyPixels/emoji-toolkit.
 
 === "Twemoji"
-    [Twemoji][twemoji] (<img align="absmiddle" alt=":smile:" class="twemoji" src="https://twemoji.maxcdn.com/v/latest/72x72/1f604.png" title=":smile:" /> <img align="absmiddle" alt=":heart:" class="twemoji" src="https://twemoji.maxcdn.com/v/latest/72x72/2764.png" title=":heart:" /> <img align="absmiddle" alt=":thumbsup:" class="twemoji" src="https://twemoji.maxcdn.com/v/latest/72x72/1f44d.png" title=":thumbsup:" />):
+    [Twemoji][twemoji] (<img align="absmiddle" alt=":smile:" class="twemoji" src="https://cdnjs.cloudflare.com/ajax/libs/twemoji/14.0.2/72x72/1f604.png" title=":smile:" /> <img align="absmiddle" alt=":heart:" class="twemoji" src="https://twemoji.maxcdn.com/v/latest/72x72/2764.png" title=":heart:" /> <img align="absmiddle" alt=":thumbsup:" class="twemoji" src="https://twemoji.maxcdn.com/v/latest/72x72/1f44d.png" title=":thumbsup:" />):
     Twemoji is Twitter's open source emoji set which also covers a great many emoji with skin tones and gender modifiers.
     The hosted CDN provides 72x72 PNG emoji or SVG emoji.
 

pymdownx/emoji.py

@@ -35,8 +35,8 @@
 UNICODE_VARIATION_SELECTOR_16 = 'fe0f'
 EMOJIONE_SVG_CDN = 'https://cdnjs.cloudflare.com/ajax/libs/emojione/2.2.7/assets/svg/'
 EMOJIONE_PNG_CDN = 'https://cdnjs.cloudflare.com/ajax/libs/emojione/2.2.7/assets/png/'
-TWEMOJI_SVG_CDN = 'https://twemoji.maxcdn.com/v/latest/svg/'
-TWEMOJI_PNG_CDN = 'https://twemoji.maxcdn.com/v/latest/72x72/'
+TWEMOJI_SVG_CDN = 'https://cdnjs.cloudflare.com/ajax/libs/twemoji/14.0.2/svg/'
+TWEMOJI_PNG_CDN = 'https://cdnjs.cloudflare.com/ajax/libs/twemoji/14.0.2/72x72/'
 GITHUB_UNICODE_CDN = 'https://github.githubassets.com/images/icons/emoji/unicode/'
 GITHUB_CDN = 'https://github.githubassets.com/images/icons/emoji/'
 NO_TITLE = 'none'