docs: use tabs to show different installation types

[arkodg]

Description:

Describe the issue.

Instead of highlighting in different pages, use tabs to show different ways to install EG

• helm
• kubectl
• egctl

https://gateway.envoyproxy.io/latest/install/

[optional Relevant Links:]

Any extra documentation required to understand the issue.

[arkodg]

wdyt @Xunzhuo @eitansuez

[eitansuez]

tabs are very effective in many situations. one possible use case is how each task (user guide) often shows how to test a configuration both with, and without a external load balancer support. the installation instructions for helm or kubectl seem to be just fine "as is": with a dedicated page for each. but nothing prevents us from trying it out with tabs and contrasting the two and then deciding which variant is preferable.

[github-actions[bot]]

This issue has been automatically marked as stale because it has not had activity in the last 30 days.

[Manoramsharma]

Hi @arkodg I have already figured out the changes to this issue and as it was stale for 30 days. I am directly opening a PR corresponding to it. Hope this is fine.

[github-actions[bot]]

This issue has been automatically marked as stale because it has not had activity in the last 30 days.