[Docs] Images are displayed too large

[fitzergerald]

Current State

Image size is out of control on some of the pages, like https://docs.layer5.io/kanvas/concepts/relationships/

Desired State

Show a thumbnail.

Allow visitors to click on the thumbnail to view a larger size, if they want to.

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[leecalcote]

Thank you, @fitzergerald. This is a good request.

[Ravnoor12]

Hello @leecalcote , I wanted to complete this task. Can you please assign this issue to me. Thanks.

[leecalcote]

Thank you, @Ravnoor12

[leecalcote]

Let's ensure sane defaults for images displayed via html tag and via markdown tag.