Add minimum browser versions to the documentation

[MrWaip]

Describe the problem

Hello.

We have encountered the fact that the documentation is not entirely clear what minimum browser versions svelte@5 requires.

I would like to understand what things need to be polyfilled on older versions of browsers.

For example, on 70 and 71 versions of Chrome, Svelte does not work because there is no queueMicrotask and getAnimations.

Describe the proposed solution

Supplement the documentation with information on browser support

Importance

would make my life easier

[flayks]

I agree it would be nice to have more informations about what modern means in terms of specs and versions. Although, who is using a 6yo version of Chrome? 😅

[harrisi]

getAnimations became generally available in March 2020. I'm not sure what other features would be more modern than that.

[MrWaip]

Chrome version 70 is a really old device, Android 9 approximately. It depends on the audience, where I work it is very broad. And there are users with old devices on which auto-updates are disabled because there is little memory on the device.