docs: move deprecation status of legacy schema1 images to "removed"

[thaJeztah]

• relates to Remove support for pulling v2 schema1 moby/moby#42300

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 55.04%. Comparing base (68ef98d) to head (f05025c).
Report is 13 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6095   +/-   ##
=======================================
  Coverage   55.04%   55.04%           
=======================================
  Files         361      361           
  Lines       30139    30139           
=======================================
  Hits        16590    16590           
  Misses      12592    12592           
  Partials      957      957           

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