prevent a try catch from hiding a build error, also fix build/emoji.js in Windows

[trusktr]

Summary

I removed the try-catch from build/emoji.js because it prevented the output from being helpful when there was an error, and made the script exit with zero instead of non-zero upon error so a build would pass which would make it even less obvious that there was an error.

Also improve the regex in build/emoji.js so that it works with CRLF or LF just in case of... Windows.

Related issue, if any:

• https://github.com/docsifyjs/docsify/issues/2290

What kind of change does this PR introduce?

Build-related changes Repo settings

For any code change,

• [x] Related documentation has been updated, if needed
• [x] Related tests have been added or updated, if needed

Does this PR introduce a breaking change?

No

Tested in the following browsers:

N/A

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[jhildenbiddle]

@trusktr --

Can we close this now that #2288a and #2436 have been merged?