Announcing LTSP 21.01

Copied from https://github.com/ltsp/ltsp/issues/1#issuecomment-753452587
Happy new year to all!
And as always, special thanks to Vagrant for uploading to Debian.

## Announcing LTSP 21.01

A new version LTSP 21.01 is available in the [proposed 
PPA](https://ltsp.org/advanced/proposed-ppa/). Please test and verify 
that it doesn't cause any issues for you, as it will be uploaded in the 
[stable PPA](https://ltsp.org/docs/ppa/) and in [Debian 
testing](https://packages.debian.org/bullseye/ltsp) in a few days.

Changelog from the previous version:

   * Update copyright in man pages
   * Support openssh 8.4 (#358)
   * Document separate partitions in ltsp image (#347)
   * Correctly pass SSH_OPTIONS to pamltsp (#114)
   * Increase SSHFS cleanup timeout
   * Avoid more than 2 login error messages (#353)
   * Remove all resume configuration files (#346)
   * Transform INCLUDE into section_call (#343)
   * Rename Raspbian to Raspberry Pi OS (#342)
   * Allow NFS home in live CDs (#138)
   * Avoid tmpfs home (#338)
   * Make images accessible only by root (#336)
   * Document the correct /etc/ltsp/bin/sshfs path (#341)
   * Initial SSSD/LDAP support (#338)
   * Update issue template for discussions
   * Prevent AUTOLOGIN blocking boot in unmatched clients (#157)
   * Disable nfs-kernel-server by default
   * Update ltsp.conf.5.md


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