Stork guide minor improvements and cross linking

[loicmathieu]

Some minor enhancement to the Stork guide and cross linking.

The title and introduction section of the Stork with Kubernetes was the same as the Getting Started one which is disturbing.

I also think the title of the Stork guide on the guide page should be updated to "Getting Started with Stock" or even better "Service discovery and Load Balancing with Stork" but I don't remember where to modify the title.

[gsmet]

The title for the website should be changed here: https://github.com/quarkusio/quarkusio.github.io/blob/develop/_data/guides-latest.yaml (and also in the guides-main.yaml).

[loicmathieu]

@gsmet now that you say it, I remember it ;)
I'll send a PR, which title should be best ?
"Getting Started with Stock" or "Service discovery and Load Balancing with Stork"

[gsmet]

I will let @cescoffier choose :).

[cescoffier]

I would go with "Service discovery and Load Balancing with Stork". It's longer but more explicit for people that never heard about Stork (and I met a few...).