✨🥔 Components: Expose ButtonComponent#danger variant

- #1187

As part of #1592 I needed
a Button that used the `dange` variant and all the turbo-y goodness.

So I pulled a variant into the `ButtonComponent`; and then we can search
for `--danger` and purge them.

app/components/button_component.rb

@@ -3,7 +3,8 @@
 class ButtonComponent < ApplicationComponent
   SCHEME_MAPPINGS = {
     primary: :primary_classes,
-    secondary: :secondary_classes
+    secondary: :secondary_classes,
+    danger: :danger_classes
   }.with_indifferent_access.freeze
 
   def initialize(
@@ -61,6 +62,7 @@ def base_classes
       "shadow-sm",
       "ring-1",
       "ring-inset",
+      "text-center",
       "no-underline",
       "focus-visible:outline",
       "focus-visible:outline-2",
@@ -79,6 +81,10 @@ def secondary_classes
     ]
   end
 
+  def danger_classes
+    ["bg-danger-500 hover:bg-danger-700 active:bg-danger-200 text-white"]
+  end
+
   def primary_classes
     [
       "bg-purple-600",