Add support for large repos

[fregante]

• Closes https://github.com/download-directory/download-directory.github.io/issues/41

Test URLs:

This works:
https://github.com/phracker/MacOSX-SDKs/tree/master/MacOSX10.1.5.sdk

This takes forever and reaches API limits
https://github.com/phracker/MacOSX-SDKs/tree/master/MacOSX10.14.sdk

• The latter URL triggers https://github.com/download-directory/download-directory.github.io/issues/39

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