.* in .gitignore causes mdbook to ignore everything

[simonmichael]

If you have .* in .gitignore, intending to make git and/or mdbook ignore dotted files, mdbook watch/serve will ignore everything. I suspect mdbook's parsing of .gitignore is not fully git compliant.

[weihanglo]

There is a weird feature(?) in gitignore.rs: it appends an * if the pattern is unanchored. https:/nathankleyn/gitignore.rs/blob/590793e8/src/pattern.rs#L92-L95.

I propose using ignore instead. ignore is more maintained and provides hands of configuration for global/local .gitignore/.ignore files. This can make other ideas (#1187, #1440, #1487) more likely become true. We can moreover safely remove fn find_gitignore().

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Off topic. The current description of gitignore in mdbook guide is incorrect. We actually respect .gitignore in parent dirs.