Add Colemak (Czech) keyboard layout to CentOS/RHEL/Rocky linux

• 1 Create backup of /usr/share/X11/xkb including file permissions before any changes.
  
• 2 Add new code block to both /usr/share/X11/xkb/rules/evdev.xml and /usr/share/X11/xkb/rules/xorg.xml:
  <variant>
  <configItem>
  <name>colemakcz</name>
  <description>Czech (Colemak)</description>
  </configItem>
  </variant>
  
• 3 Add this line somewhere to both /usr/share/X11/xkb/rules/xorg.lst and /usr/share/X11/xkb/rules/evdev.lst:
  colemakcz cz: Czech (Colemak)
  
• 4 Append new xkb code block from https://web.archive.org/web/20211230105013/https://raw.githubusercontent.com/matj1/cs_colemak/master/cs_colemak at the end of /usr/share/X11/xkb/symbols/cz Replace xkb_symbols string at the beginning of the code block with "colemakcz" plus consider uncommenting CAPS as BackSpace line which is recommended.
  
• 5 Check if new layout is added correctly in Settings -> Region and Languague -> Input sources .. Other
  Restart the system and Use AltGr+Key to write letters with Czech punctuation.
  

References

• https://github.com/matj1/cs_colemak
• https://forum.colemak.com/topic/1447-colemak-czech-3rd4rd-layer-mod/
• https://medium.com/@vojtajina/my-keyboard-layout-is-better-than-yours-f23b19d1b046
• https://colemak.com/
• https://web.archive.org/web/20211230105013/https://raw.githubusercontent.com/matj1/cs_colemak/master/cs_colemak