v0.9.1-beta.2 — first app store release

Second beta, the first release in the Nextcloud app store (signed).

Added

• App store listing: screenshots, website, repository and documentation link in appinfo/info.xml.

Fixed

• Restore: the "new folder" option showed "Restored " without the date pattern.
• Restore: the restore-point dropdown cut off the time.
• Settings: the passphrase actions are on one line instead of stacked.
• docs/HOWTO.md: the SFTP example used a non-existent auth mechanism (sftp::password
  instead of password::password).

Package

ng_backup-0.9.1.tar.gz is the signed app store package (code-signed with the Nextcloud certificate for ng_backup); .sig is its app store signature.