README updates: Add occ command examples; Clean up readme tables; Cle…

…an up branding; change supported k8s version (nextcloud#414)

* Add occ command examples; Clean up readme tables

also fixing Nextcloud branding and bumping supported version of k8s

Signed-off-by: jessebot <jessebot@linux.com>

* Use shell instead of bash in occ example; fix grammar

Co-authored-by: Kate <26026535+provokateurin@users.noreply.github.com>
Signed-off-by: jesseBot <jessebot@linux.com>

* Apply suggestions from code review - fixing rest of the /bin/bash examples to be /bin/sh

Signed-off-by: jesseBot <jessebot@linux.com>

* Apply suggestions from code review - more grammar fixes :)

Co-authored-by: Kate <26026535+provokateurin@users.noreply.github.com>
Signed-off-by: jesseBot <jessebot@linux.com>

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Signed-off-by: jessebot <jessebot@linux.com>
Co-authored-by: Kate <26026535+provokateurin@users.noreply.github.com>