docs: Remove 'pip install' options in recipes

[matthewfeickert]

Motivated by conda/grayskull#582 and @wolfv's comment conda/grayskull#582 (comment)

• Remove --no-deps, --no-build-isolation, and --ignore-installed pip install options in recipes as rattler-build will enforce all required pip install options itself at build time.

c.f.

rattler-build/src/env_vars.rs

Lines 230 to 239 in 665125d

	// python variables
	// hard-code this because we never want pip's build isolation
	// https://github.com/conda/conda-build/pull/2972#discussion_r198290241
	//
	// Note that pip env "NO" variables are inverted logic.
	// PIP_NO_BUILD_ISOLATION=False means don't use build isolation.
	insert!(vars, "PIP_NO_BUILD_ISOLATION", "False");
	// Some other env vars to have pip ignore dependencies. We supply them ourselves instead.
	insert!(vars, "PIP_NO_DEPENDENCIES", "True");
	insert!(vars, "PIP_IGNORE_INSTALLED", "True");

[matthewfeickert]

This is ready for review. Though as this is my first PR to the repo, I'm going to need someone on the dev team to approve a run of the CI.

[wolfv]

Thanks @matthewfeickert :)