build(deno): speed up Rollup copy step

[markdalgleish]

On my machine the Rollup build can be quite slow with initial builds taking 30s, but it was more of a papercut since rebuilds were fast. I was able to narrow it down to the usage of the gitignore: true option for rollup-plugin-copy on the @remix-run/deno package which no other package uses. I was able to achieve the same build output while avoiding this option.

Note that the removed .gitignore file was only present for rollup-plugin-copy to pick up, so with this config change it became redundant.

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