📄 readme + config updates

[colinwilson]

Changes

• update readme
• update Netlify config
• update minimum Hugo version to 0.120.0

Tests

• [x] Automated tests have been added
• [ ] This PR does not require tests

Documentation

• [ ] Docs have been updated
• [x] This change does not need a documentation update

Dark mode

• [ ] The UI has been tested both in dark and light mode
• [x] This PR does not change the UI

[netlify[bot]]

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