Docs for `env` key updates

- [x] #1970
- [x] #1950
- [ ] codemod
- [ ] lint rule


This PR will include: 

- guide and reference docs updates
- blog post

This PR will be ready for review after all the code pieces are merged.

Co-authored-by: Thomas Knickman <2933988+tknickman@users.noreply.github.com>

Co-authored-by: Thomas Knickman <tom.knickman@vercel.com>

* 1.5 blog

* Changed meta and title

* Added og image

* Fixed comma

* Added links

* Added Social Network embed

* Rewrote section on prune

* Removed npm from announcement

* Update docs/pages/blog/turbo-1-5-0.mdx

Co-authored-by: Thomas Knickman <tom.knickman@vercel.com>

* Added changes from code review

* Changed prune docs

* Fixed og image

* Changed to 2+

* Dropped the drop the run

* Update docs/pages/blog/turbo-1-5-0.mdx

* Update docs/pages/blog/turbo-1-5-0.mdx

* Update docs/pages/blog/turbo-1-5-0.mdx

* Update docs/pages/blog/turbo-1-5-0.mdx

* Update docs/pages/blog/turbo-1-5-0.mdx

Co-authored-by: Thomas Knickman <tom.knickman@vercel.com>
Co-authored-by: Jared Palmer <jared@jaredpalmer.com>

Co-authored-by: Greg Soltis <greg.soltis@vercel.com>

My first task! Converts the code that adds `.turbo` to `.gitignore` from a grep command to some regular Go code. Fixes a bug with grep not detecting `.turbo` if there's leading or trailing whitespace.

Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>

 - Ensure we are binding `--api` and `--team` to `viper`. 
 - Ensure we don't mix a config-produced teamId with a flag-produced teamSlug
 - Add a test for the desired behavior

Fixes #2040

Unsorted environment variables cause hashes to be unstable, meaning a large number of environment variables leads to essentially no cache hits.

Fixes #2029