point send-main-page to racket website when docs not found #164
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Currently,
raco docswill open a web browser to a "file not found" page when docs are not installed anddoc-open-urlis not set inconfig.rktd. This can be an issue for linux distributions which package the docs separately from racket itself, because modifyingconfig.rktddynamically as part of the install process could overwrite a user's preference.This PR fixes the issue by pointing
send-main-pageto "https://docs.racket-lang.org/" when docs can not be found.