Update README with permissions and ownership setup

[UweKrause]

Fixed folder creation command and added permissions and ownership commands for dashboard data.

Fixing

traefik-log-dashboard        |  ⨯ SqliteError: unable to open database file
traefik-log-dashboard        |     at l (.next/server/chunks/219.js:1:534)
traefik-log-dashboard        |     at 36903 (.next/server/chunks/219.js:151:229)
traefik-log-dashboard        |     at c (.next/server/webpack-runtime.js:1:127)
traefik-log-dashboard        |     at 40334 (.next/server/app/api/logs/access/route.js:1:978)
traefik-log-dashboard        |     at c (.next/server/webpack-runtime.js:1:127)
traefik-log-dashboard        |     at <unknown> (.next/server/app/api/logs/access/route.js:1:7990)
traefik-log-dashboard        |     at c.X (.next/server/webpack-runtime.js:1:1191)
traefik-log-dashboard        |     at <unknown> (.next/server/app/api/logs/access/route.js:1:7968)
traefik-log-dashboard        |     at Object.<anonymous> (.next/server/app/api/logs/access/route.js:1:8022) {
traefik-log-dashboard        |   code: 'SQLITE_CANTOPEN'
traefik-log-dashboard        | }

[hhftechnology]

can you submit this pr against DEV branch