Blog post, instructions.md on environment and activations

[anthonykim1]

In the efforts to share knowledge and provide a place where everyone can be on the same page, we should have instructions.md explaining about various activations.

Thanks @eleanorjboyd in taking on sharing Conda related!
I think diagrams for complicated scenarios will be super-useful for people as well.

Also a blog post:
I can talk about the activation journey: from pre-terminal env var experiment --> terminal env var experiment --> shell startup activation ---> migrating this into core, would help people better understand all the efforts went in.

Things like Poetry changing its behavior around venv may be worth mentioning too.

/cc @cwebster-99

[cwebster-99]

Love this! Happy to help or review any content you put together!