Customise generated index.js about krell HOT 3 CLOSED

@wodin sorry for the delay - I've added a thing to master to make this easier in a couple of ways. There's now a command line flag to supply custom index.js on the classpath - and for people who want to compose some kind of template (without forcing users to supply args) - we try krell_index.js before defaulting to index.js.

Please give it a try. If it works for you we can close this.

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@wodin great! I'll cut 0.5.3 tomorrow.

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Yes, this works. I copied the patched index.js to src/krell_index.js and that was used to generate the correct index.js.

This took me a while to get working because I couldn't work out how to get krell to connect to the right IP address. The last time I tried it it connected to my VPN IP address. This time it was connecting to a docker IP, so I could not just start my VPN to get things working.

Part of the problem was because I didn't realise that the --host option is silently ignored if you do this:

clj -M -m krell.main -co build.edn -r --host blah

I eventually worked out you have to specify it during the compile step.

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