Trim JS rewrapping modules to the bare minimum needed

[ghost]

#19 Addressed properly wrapping rescript page modules with JS. This issue involves reducing the code in each of these boilerplate files down. This example (https://github.com/reason-association/rescript-lang.org/blob/master/pages/blog/%5Bslug%5D.js) is probably the least amount of code to accomplish the same behavior. Try using that and replacing existing wrappers with that code instead.

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[ghost]

Convert this back into an issue. Add it as a prerequisite for #140

[agarwal]

Convert this back into an issue. Add it as a prerequisite for #140

Or maybe just add comments to #140, stating how the new code should look. That way the code generator there can simply implement the suggestion. I'm not sure it'll be worth making this change manually to all of our files if #140 will delete them and auto-generate.