Feature/accessibility improvements

[MMasey]

Hey @CarlSargunar

Here's that little accessibility related PR for you that I mentioned at Spark. I could only update the form partial example in this repo, but the same kind of thing would likely apply to the actual plugin repo.

When going through this I noticed you could also potentially include an example using the in built form tag templates too. e.g.

@* I'm not sure if Umbraco has a built in tag helper for the equivalent for "BeginUmbracoForm" *@
<form asp-controller="SimpleFormsSurface" asp-action="Submit" method="post">
    <div class="mb-3">
        <label asp-for="Name" class="form-label"></label>
        <input asp-for="Name" class="form-control" placeholder="@Html.DisplayNameFor(m => m.Name)" />
        <span asp-validation-for="Name" class="text-danger"></span>
    </div>
    <div class="mb-3">
        <label asp-for="Email" class="form-label"></label>
        <input asp-for="Email" class="form-control" placeholder="@Html.DisplayNameFor(m => m.Email)" />
        <span asp-validation-for="Email" class="text-danger"></span>
    </div>
    <div class="mb-3">
        <label asp-for="Message" class="form-label"></label>
        <textarea asp-for="Message" class="form-control" placeholder="@Html.DisplayNameFor(m => m.Message)"></textarea>
        <span asp-validation-for="Message" class="text-danger"></span>
    </div>
    <button type="submit" class="btn btn-primary">Submit</button>
</form>

[CarlSargunar]

Wonderful stuff - thanks Mike, really appreciate it, and I plan on doing more on this in the next couple of weeks myself after I've recovered.

I plan to add and talk about it a lot more in the run - up to codegarden too, really looking forward to it