Add SPDX header - Part 2

[AndyScherzinger]

mostly covering cypress/.../img assets

SUMMARY

• Bad licenses: 0
• Deprecated licenses: 0
• Licenses without file extension: 0
• Missing licenses: 0
• Unused licenses: 0
• Used licenses: LicenseRef-MastodonTrademarks, LicenseRef-GooglePlayBadge, LicenseRef-XTrademarks, LicenseRef-AppleAppStoreBadge, CC-BY-SA-2.0, LicenseRef-NextcloudTrademarks, MIT, AGPL-3.0-or-later, LicenseRef-FacebookTrademarks, Apache-2.0
• Read errors: 0
• Files with copyright information: 806 / 1180
• Files with license information: 782 / 1180