Add jsm and mjs extensions to application/javascript media type associations

[jmooring]

Reference: https://discourse.gohugo.io/t/37084

Hugo does not currently associate the .jsm or .mjs extensions with the application/javascript media type.

When using resources.GetRemote, our content/extension validation is system-dependent, where the local MIME database is loaded and read.

For example, on the OP's system, and on mine:

$ cat /usr/share/mime/globs2 | grep javascript

50:application/javascript:*.jsm
50:application/javascript:*.mjs
50:application/javascript:*.js

Hugo ends up with the first one on the list.

[github-actions]

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