Convert WOTD feed to D10

Problem/Motivation

The port of the WOTD feed at /g2/feed/wotd has been at least partly implemented but not double checked, and has no tests.

Steps to reproduce

n.a.

Proposed resolution

• check/port route
• check/port controller, splitting logic to use the WOTD service and possibly the ParamConverter so we have a lightweight controller.
• check/port settings form
• check/port theme, possibly replacing by just a node view with a specific view mode or a View if it is not already applied
• general cleanup of remaining procedural code

Remaining tasks

Do it.

User interface changes

The UI in the feed might change slightly due to use of view modes.

API changes

The path and associated content type (RSS) remain unchanged.

Data model changes

D6/7 to D8+