Update languages.json: MDX Support (#445)

* Update languages.json: MDX Support

I believe mdx files will be supported by adding the extension to the markdown block. The syntax *is* markdown.

* UPdate another file

* update to languages.json and LANGUAGES.MD

Signed-off-by: Sean P. Goggins <s@goggins.com>

* Decided to tread MDX files as their own thing since they are common in web apps

Signed-off-by: Sean P. Goggins <s@goggins.com>

* not sure how I got out of sync. Fixed

Signed-off-by: Sean P. Goggins <s@goggins.com>

---------

Signed-off-by: Sean P. Goggins <s@goggins.com>

LANGUAGES.md

@@ -160,6 +160,7 @@ Makefile (makefile,mak,mk,bp,makefile,gnumakefile)
 Mako (mako,mao)
 Markdown (md,markdown)
 MATLAB (m)
+MDX (mdx)
 Meson (meson.build,meson_options.txt)
 Modula3 (m3,mg,ig,i3)
 Module-Definition (def)

languages.json

@@ -4838,6 +4838,15 @@
       }
     ]
   },
+  "MDX": {
+    "complexitychecks": [],
+    "extensions": [
+      "mdx"
+    ],
+    "line_comment": [],
+    "multi_line": [],
+    "quotes": []
+  },
   "Modula3": {
     "complexitychecks": [
       "for ",