[DOCS] update card component styling to be consistent regardless of screen size

[SKorchinskiy]

I've opened the main page of the docs on my MacBook Air M1 13.3" and the card component looks inconsistent:

As you can see from the screenshot above, the "run a node"-card is shorter than other cards.

To solve this issue, I've added additional styling which is meant to make card component's height the same among components regardless of screen size

Now it looks like this:

I've also fixed it for smaller screens. For example, the main page with 1001x1125 screen parameters currently looks like this:

However, with the changes I've made, it looks like this:

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Name	Status	Preview	Comments	Updated (UTC)
doc-zk-evm	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 27, 2024 4:11pm

[SKorchinskiy]

Hi, @jlwllmr. This PR is ready for a review

[jlwllmr]

thanks @SKorchinskiy. Tagging in @sammysango who takes care of the site's design

[jlwllmr]

@SKorchinskiy hey, we merged an improvement along these lines separately in #631 as it's something that was on our roadmap to fix anyway — we used a different approach, but we already had something like the logic we needed from a different repo so opted for that method. Thank you for prompting us on this.