[DOC] nextcloud examples are out of date (compose)

[sbe-arg]

Description

https://github.com/bunkerity/bunkerweb/blob/master/examples/nextcloud/docker-compose.yml

if you use NC talk specially. it is not clear how to handle policies.

Proposed solution (optional)

      - site_CONTENT_SECURITY_POLICY_REPORT_ONLY=yes
      - site_PERMISSIONS_POLICY=accelerometer=(), ambient-light-sensor=(), autoplay=(), battery=(), camera=(self), cross-origin-isolated=(), display-capture=(), document-domain=(), encrypted-media=(), execution-while-not-rendered=(), execution-while-out-of-viewport=(), fullscreen=(), geolocation=(), gyroscope=(), hid=(), idle-detection=(), magnetometer=(), microphone=(self), midi=(), navigation-override=(), payment=(), picture-in-picture=(), publickey-credentials-get=(), screen-wake-lock=(), serial=(), usb=(), web-share=(), xr-spatial-tracking=()
      - site_FEATURE_POLICY=accelerometer 'none'; ambient-light-sensor 'none'; autoplay 'none'; battery 'none'; camera 'self'; display-capture 'none'; document-domain 'none'; encrypted-media 'none'; execution-while-not-rendered 'none'; execution-while-out-of-viewport 'none'; fullscreen 'none'; geolocation 'none'; gyroscope 'none'; layout-animation 'none'; legacy-image-formats 'none'; magnetometer 'none'; microphone 'self'; midi 'none'; navigation-override 'none'; payment 'none'; picture-in-picture 'none'; publickey-credentials-get 'none'; speaker-selection 'none'; sync-xhr 'none'; unoptimized-images 'none'; unsized-media 'none'; usb 'none'; screen-wake-lock 'none'; web-share 'none'; xr-spatial-tracking 'none';

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