[Feature] add a new org-attach dispatcher command to offline save web page

[stardiviner]

I attached the patch.

I think this feature will be helpful for use who archive web page data usually
like me. To be more portable, I also added an defcustom option for other
external command. And use an if condition to detect whether external command
available, else warning user.

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[ stardiviner ]
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0001-org-attach.el-add-a-new-command-to-offline-save-web-.patch
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