tailwind: upgrade a17t, somewhat functional dark mode

instead of adding dark: variants to each element, a preprocessor script
adds them. still needs to be implemented to typescript.

html/password-reset.html

@@ -12,7 +12,7 @@
         </div>
         {{ end }}
         <div class="page-container">
-            <div class="card ~neutral !normal mb-1">
+            <div class="card ~neutral @low mb-1">
                 <span class="heading mb-1">
                 {{ if .success }}
                 {{ .strings.passwordReset }}
@@ -35,7 +35,7 @@
                 <aside class="aside ~warning">
                     {{ .strings.changeYourPassword }}
                 </aside>
-                <span class="button ~urge !normal full-width center supra p-1 mt-1" id="pin" title="{{ .strings.copy }}">{{ .pin }}</span>
+                <span class="button ~urge @low full-width center supra p-1 mt-1" id="pin" title="{{ .strings.copy }}">{{ .pin }}</span>
                 {{ end }}
             </div>
             <i class="content">{{ .contactMessage }}</i>