remove HTML tags from documentation

[freegroup]

please remove native HTML tags from the documentation. Makes things easier to integrate
in the new gardener.cloud landing page.

not so good

<img align=right src="doc/[email protected]" height="200">

better

![image](doc/[email protected]?raw=true)

in https://github.com/gardener/kubify/blob/master/README.md

[afritzler]

Here as well, feel free to file a PR :-)

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