[FW][FIX] developer: rewrite a bunch of outdated info in JS reference #9196
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Previously, a lot of information on the JavaScript reference page was outdated.
This commit rewrites a bunch of sections to bring them up to date and removes others that are no longer relevant. While a more profound rework of the JS documentation is still needed, this commit at least reduces the amount of outdated information significantly in the meantime.
Forward-Port-Of: #9180