Documentation | README: Update OpenSUSE instructions with container (!102)

[Gedare Bloom (@gedare)]

Gedare Bloom commented: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/merge_requests/102#note_117835


I removed the updates to #60 as it is not relevant. 

The complexity of README.md is getting to the point it may be worth creating a doc on building the docs.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/merge_requests/102#note_117835
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