+ Removed highlight-quoted block because `highlight-quoted-mode` is already autoloaded by the package
+ Removed org-babel-do-load-languages because lang/org/+babel already has a built-in autoloader for ob-* packages.
+ Removed flycheck-mode from racket-mode hook because it is enabled globally in :feature syntax-checker
+ Removed highlight-numbers-mode from racket-mode-hook because it is enabled on prog-mode-hook in core-ui (as of #770)
+ Fix racket popup rule regexp
+ Remove popup rules that were redundant with the defaults
+ Remove racket-mode-specific company-frontends value, looks like personal preference, otherwise should be set in a separate hook function that is easily recognized and disabled, if the user desires.
+ Remove :interpreter and :mode properties because they are already registered by the racket-mode package.
+ Move racket-unicode-input-method-enable into :hook property (to defer the config)
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