Convert Doks params config to TOML

[salim-b]

Summary

Converts template-doks/config/_default/params.yml to template-doks/config/_default/params.toml. No settings were changed and comments were retained.

Motivation

Harmonization (the rest of the Hugo config is already in TOML format).

Checks

• [x] Read Create a Pull Request
• [x] Supports all screen sizes (if relevant)
• [x] Supports both light and dark mode (if relevant)
• [ ] Passes npm run test