fix(rescripls): enable typechecking, improve doc #3281
Merged
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I was very confused to find that I got no typechecking by default, since ReScript is meant to be a very-strongly-typed language. The intent seems to be to use the "askToStartBuild" option to start an external build, which integrates with the lsp for typing, but that prompt is much too buggy, and the incremental typing (enabled in this PR) works well for me.