[AP] Implement robots.txt in Next Build

[timcosgrove]

Description

Robots.txt is currently managed by Content Build. This will need to move to Next Build as part of the migration away from Content Build.

The contents of Robots.txt should be revisited with various teams/people to ensure it is up-to-date and serving needs correctly.

Acceptance Criteria

• The appropriate teams and people are consulted to figure out desired content in robots.txt
• Robots.txt is implemented within Next Build per Next.js guidelines to produce the desired content
• Robots.txt acts appropriate for each environment

Supporting details

Interested people

• Mikki Northeius
• Frontend COP
• Analytics team, potentially

Robots.txt in Next.js

Next.js provides documentation for implementing robots.txt. This would almost certainly be a Typescript file that responds to app environment so that it can provide the correct output per environment.

Current robots.txt

The current robots.txt from Content Build is a text file. However, the file is processed by an Update Robots plugin that rewrites robots.txt to simply disallow crawling.

There are a number of Disallow rules that may no longer apply. Each of these should be revisited.