Ingore changes to .direnv and .gitignore

[ehmry]

The Direnv tool is useful to run within rules (by prefixing commands with "direnv exec .") but it creates a cache of metadata at .direnv which Tup should not be tracking. It may also make changes to .gitignore which would not effect reasonable build jobs.

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This is a quick and simple fix, an alternative would be to add some sort of general "tupignore" mechanism for ignoring the cache artifacts created by various tools.

[toastal]

s/Ingore/Ignore/g

This should be two separate commits. Not sure why you would want to ignore the Gitignore tho.