Merge branch 'update-anvil-images' into 'master'

Update Anvil image list.

See merge request !345

static/markdown/anvil-images.md

 |       Image Name         |  Username to Connect  |        Access instructions           |                                 Description                                       |
 | ------------------------ | --------------------- | ------------------------------------ | --------------------------------------------------------------------------------- |
-| Alma Linux 8.5           |  `almalinux`          | `ssh -l almalinux@<ip address>`      | AlmaLinux is a free and open source Linux distribution that is binary-compatible with Red Hat Enterprise Linux (RHEL).|
+| Alma Linux 8.5           |  `almalinux`          | `ssh -l almalinux <ip address>`      | AlmaLinux is a free and open source Linux distribution that is binary-compatible with Red Hat Enterprise Linux (RHEL).|
+| Alma Linux 8.6           |  `almalinux`          | `ssh -l almalinux <ip address>`      | AlmaLinux is a free and open source Linux distribution that is binary-compatible with Red Hat Enterprise Linux (RHEL).|
 | Cloudera 5.12 GNOME      |  `cloudera`           | [X2Go instructions](/anvil/connecting_to_linux_instances_using_x2go/) | Cloudera 5.12 QuickStart VM. *Note*: Follow the X2Go instructions, but choose GNOME for the Session type instead of Xfce.|
-| CentOS 7.4               |   `centos`            | `ssh -l centos@<ip address>`         | The CentOS Linux distribution is a stable, predictable, manageable and reproducible platform derived from the sources of Red Hat Enterprise Linux (RHEL).|
-| CentOS 7.8               |   `centos`            | `ssh -l centos@<ip address>`         | The CentOS Linux distribution is a stable, predictable, manageable and reproducible platform derived from the sources of Red Hat Enterprise Linux (RHEL).|
+| CentOS 7.4               |   `centos`            | `ssh -l centos <ip address>`         | The CentOS Linux distribution is a stable, predictable, manageable and reproducible platform derived from the sources of Red Hat Enterprise Linux (RHEL).|
+| CentOS 7.8               |   `centos`            | `ssh -l centos <ip address>`         | The CentOS Linux distribution is a stable, predictable, manageable and reproducible platform derived from the sources of Red Hat Enterprise Linux (RHEL).|
 | CentOS 7.4 Xfce          |   `centos`            | [X2Go instructions](/anvil/connecting_to_linux_instances_using_x2go/) | CentOS 7.4 with the Xfce Desktop Environment pre-installed.|
-| CentOS 8.1               |   `centos`            | `ssh -l centos@<ip address>`         | The CentOS Linux distribution is a stable, predictable, manageable and reproducible platform derived from the sources of Red Hat Enterprise Linux (RHEL).|
+| CentOS 8.1               |   `centos`            | `ssh -l centos <ip address>`         | The CentOS Linux distribution is a stable, predictable, manageable and reproducible platform derived from the sources of Red Hat Enterprise Linux (RHEL).|
 | Fedora 32 Cloud	   |   `fedora`            | `ssh -l fedora <ip address>`          | Fedora is a Linux distribution developed by the community-supported Fedora Project and sponsored by the Red Hat company.|
 | Fedora 33 Cloud          |   `fedora`            | `ssh -l fedora <ip address>`          | Fedora is a Linux distribution developed by the community-supported Fedora Project and sponsored by the Red Hat company.|
 | Fedora 32 Xfce           |   `fedora`            | [X2Go instructions](/anvil/connecting_to_linux_instances_using_x2go/) | Fedora 28 with the Xfce Desktop Environment pre-installed.|