Clarify Custom Style Wiki and Samples

[aterbo]

Per Issue #361, this PR updates the Wiki to include information on the CSS parameters that are necessary when using a custom class to avoid some of the issues identified (no z-height, misaligned headers, no styling). It also updates the samples to better show the effect of custom styles using CSS. As part of the update of the samples, a more clearly named CSS class is used (my-custom-modal-class vs blazored-prompt-dialog) and removed unused styles in the examples.

[larsk2009]

Thanks @aterbo, I think this is a great addition! I am not sure if we are updating the docs folder anymore. If we are, can you also have a look at updating that? @chrissainty do we still keep the docs up to date in that folder?

[aterbo]

@larsk2009 I'm happy to update the Docs. I missed that the first time around. I'll update the PR when I get a minute.

[chrissainty]

@aterbo No we're not using the docs folder anymore so don't worry about updating any of that. @larsk2009 maybe we should get that folder removed to avoid confusion in the future.

[larsk2009]

Yeah should definitely remove it (in a seperate PR offcourse 😉)

[aterbo]

@larsk2009 I went ahead and submitted another PR doing so. I actually did a bit of searching in the repo, and it looks like that issue has come up in the past, but always as a side conversation and never as a direct issue. Looks like it just slipped through a few times. Hope the other PR can resolve it. Deleting documentation files is easier than adding them :)

[larsk2009]

Great @aterbo!

[chrissainty]

Thanks for this @aterbo. Doc updates are always appreciated.