Improve installer and bug fixes

[justalever]

You, good folks, were having many issues running the installer, dependent on modern node versions and specific build scripts. This update normalizes the process and borrows from the jsbundling and cssbundling gems reducing their dependency. With this in place we can drop those dependencies entirely 👏.

There's an additional bug fix for Bootstrap installs where the launcher wasn’t toggling due to a missing Stimulus.js controller being installed.

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This discussion was created from the release Improve installer and bug fixes.