Add how to guides to Pants docs

[Eric-Arellano]

https://www.youtube.com/watch?v=eWaWvUhpseM differentiates between how tos vs. guides vs. API references. Right now, Pants is missing dedicated how tos for things like:

• adding a linter
• publishing lots of wheels out of a monorepo
• setting up a test to run with Pants
  • should probably include handling hermeticity and files
• building a PEX
• finding your most used code

Our current docs do have elements of how-tos, but they should be more dedicated and tutorial style, e.g. that you can follow along with.

A major part of this ticket is deciding how to organize the sidebar of our docs.

[stuhood]

A major part of this ticket is deciding how to organize the sidebar of our docs.

Another portion would be expanding and prioritizing a list of the potential howtos.

[cczona]

Blocked: We need 3 levels of nesting in the docs.

[Eric-Arellano]

Was this completed?

[cczona]

I closed a toolchain issue and somehow it closed an upstream issue. That was not my intention.