Update admin-redirect.md

[rkristelijn]

docs: add serving custom frontend to the default route /

What does it do?

It describes adding a custom frontend to the strapi service.

Why is it needed?

A question asked may times, but answer is not there. It should be part of the documentation.

Related issue(s)/PR(s)

Let us know if this is related to any issue/pull request

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Name	Status	Preview	Comments	Updated (UTC)
documentation	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 9, 2024 3:47pm

[strapi-cla]

All committers have signed the CLA.

[strapi-bot]

This pull request has been mentioned on Strapi Community Forum. There might be relevant details there:

https://forum.strapi.io/t/how-to-customize-the-root-route-page/1082/6