Re-organization of the PSY docs to follow the Diataxis format

[kdayday]

MVP of PSY docs using Diataxis

• separates tutorials on how to's into different sections
• new learn-by-doing tutorials: new basics tutorial and time-series tutorial
• multiple partially redundant how-to's were either consolidated or most complete Version was retained and the rest deleted
• some details in previous modeler guides moved into specific function docstrings, including over to infrastructure systems
• added visibility of infrastructure systems functions and structs in PSY API (such as caches)
• removed quick start guide and updated welcome page to include Sienna ecosystem intro and Diataxis Organization overview
• Remove modeling with Jump example
• Add migration guide announcement and documentation page
  - trivial type and parameter renames
  - new and removed types
  - Energy storage reservoir parameter updates (at least the ones that I/Kate did)
  - type hierarchy change
  - Horizon format
  - hybrid system (interconnection_efficiency is new, only works in 3.0),
  - Hydro status
  • cost functions

In future, to clean up how to's, including parsing how-to's, and clean up/expand explanation sections

resolves #1144
resolves #1145
resolve #935

[jd-lara]

I am going to approve as it is and propose smaller changes as we find them