Remove the "repository" column from the "Images overview" page

[flavio]

I propose to remove the "repository" column from the "images overview" page.

The content of this column is already part of the "Image Reference" column. I think we can avoid the duplication and make the page more "pleasant".

CC @oboc-sts

[flavio]

Closing, @oboc-sts pointed me the slack thread discussing this topic.

Long story short, we should keep this column around.

Relevant comment on the slack thread:

Also, we took the repository column out, but we kept the filter. Filtering on something you don’t see is no go. Either remove the filter, or bring back the column.
Considering you have the group by repository option in there, which leads to a table structure shift that actually has the repository column… I would advise for the latter option (bring back the repository column)

[oboc-sts]

Indeed, thanks @flavio . Let's re-evaluate after Kubecon and see if we can change this in the next iteration.