Improve use of space for docs

[chbrandt]

Documentation pages provide two tables of content: one -- on the left -- for the whole site, and the other -- on the right -- for the current document. For instance, I'm at Updating Configuration via a ConfigMap. The one on the right is using too much space and should be moved somewhere else (see screenshots); My suggestion is to move it also to the left, below/above the site's ToC.

Notice the amount of empty space on the (right side) pages that could be used for a better (reading) experience:

[k8s-ci-robot]

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[network-charles]

This is a hugo theme called docsy.

[sftim]

/area web-development