[mod] Add engine for Emojipedia

Emojipedia is an emoji reference website which documents the meaning and
common usage of emoji characters in the Unicode Standard.  It is owned by Zedge
since 2021. Emojipedia is a voting member of The Unicode Consortium.[1]

Cherry picked from @james-still [2[3] and slightly modified to fit SearXNG's
quality gates.

[1] https://en.wikipedia.org/wiki/Emojipedia
[2] https://github.com/james-still/searx/commit/2fc01eb20f8de5f9cac492dcdfb817a6f0636580
[3] https://github.com/searx/searx/pull/3278

searx/settings.yml

@@ -542,6 +542,12 @@ engines:
     timeout: 3.0
     disabled: true
 
+  - name: emojipedia
+    engine: emojipedia
+    timeout: 4.0
+    shortcut: em
+    disabled: true
+
   - name: tineye
     engine: tineye
     shortcut: tin