Add publicPath for static js

[sunaurus]

With the current webpack configuration, Lemmy tries to load js files from paths where there aren't any, creating errors like:

Unhandled Promise Rejection: ChunkLoadError: Loading chunk node_modules_date-fns_esm_locale_en-GB_index_js failed.
(missing: http://localhost:1234/js/node_modules_date-fns_esm_locale_en-GB_index_js.client.js)

Notice that it's loading from /js/... and not /static/js/...

This PR adds a publicPath config, which can be used to specify a base path for assets: https://webpack.js.org/guides/public-path/

As far as I can tell, this fixes #1657 (at least it fixes it for me locally).

Note: I also noticed that the regex for including assets for the ServiceWorkerPlugin was only includiding client.js, I changed it to include all paths in the js/ directory.

[sunaurus]

By the way, I'm not exactly sure what the context is with date-fn locale issues (is it a totally unrelated issue?), but this PR should fix loading date-fn files for locales other than en-US as well.

Edit: I found this - #1574 - seems to be the exact same issue. In fact, #1657 is most likely a duplicate of #1574.

[alectrocute]

@SleeplessOne1917 Are you still planning on replacing date-fns with moment.js? If so, how does that change the proposal here? Still needed?

[SleeplessOne1917]

Are you still planning on replacing date-fns with moment.js? If so, how does that change the proposal here? Still needed?

I haven't gotten around to removing it yet, but if this PR works I'd much prefer it over bringing back the moment.js dependency. I'll test it tonight.

[alectrocute]

@SleeplessOne1917 I don't think this'll resolve our ongoing timezone issues, unfortunately.

[sunaurus]

@alectrocute can I read more about the timezone issue anywhere? Maybe I can take a look at it as well

[SleeplessOne1917]

can I read more about the timezone issue anywhere? Maybe I can take a look at it as well

The issues you linked earlier would be the best place to look, though it seems you've already done that.

@alectrocute since the imports are fixed, getting the timezones working might actually be possible.