Fix: Use correct class for Liberapay <div>

Add: update policies and blog about automated opt-in survey (OpenTTD#252

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Fix: 13.1 was released in 2023, not 2022 (OpenTTD#251)

Add: 13.0 release announcement (OpenTTD#249)

Co-authored-by: Tyler Trahan <tyler@tylertrahan.com>

Add: 13.0-RC2 announcement (OpenTTD#247)

Add: 13.0-RC1 announcement (OpenTTD#243)

Add: 13-beta2 announcement (OpenTTD#240)

Fix: Typo in 13.0-beta1 announcement. (OpenTTD#239)

Change: Update Discord link now that we are verified (OpenTTD#237)

Add: Advertise Windows 11 support