www/homepage: Update to 1.13.2

• Pin nodejs to 22.
• Use @sample in .env file.
• Set .next/ directory and its files to %%USER%%/%%GROUP%% like upstream (OCI image of Homepage).

ChangeLogs:

• https://github.com/gethomepage/homepage/releases/tag/v1.12.3
• https://github.com/gethomepage/homepage/releases/tag/v1.13.0
• https://github.com/gethomepage/homepage/releases/tag/v1.13.1
• https://github.com/gethomepage/homepage/releases/tag/v1.13.2