[SPIKE] Document need and scope of tech modernization

[NatHillardUSDR]

Description

We have discussed in several places the need to modernize our frontend stack in various ways, most recently here.

Specifically we have mentioned:

• Adopting Typescript by default, and
• Moving toward React

but there are other changes we can adopt as well, now that we're focusing to a greater extent on a broader UX/UI refresh.

We should document the need behind this, the goals, and the scope for future reference as this effort evolves.

Acceptance Criteria

• this Notion page has been filled out with:
  • background
  • scope
  • sub-pages for each technical decision

[ClaireValdivia]

@TylerHendrickson looks like has be "in progress" for awhile - is the status accurate?