prevent deprecation notice in PHP 8.0 and above

specify columns on insert to be more robust regarding schema changes

update resource-integrity fingerprints

introduce the support for configuration via environment variables

updated version and copyright year

HTML-escape IMPRINT_TEXT to prevent the admin from breaking the HTML …

…output

support jumbo secrets in local encryption

updated default config to reflect new table structure

creating secret sharing links and downloading the public key is now p…

…ossible with only RSA public keys set as RSA_PRIVATE_KEYS

fixed read-only mode, introduced share-only mode, introduced human-re…

…adable public key download 403 response codes on errors