[gnome-todo] welcome-action-card: Use .card CSS class

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 89245c26655227d1a8b79c1d6f0cf56691df2361
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Wed Nov 17 23:15:13 2021 -0300

    welcome-action-card: Use .card CSS class
    
    It's provided by libadwaita now. Use it, and cleanup the
    corresponding CSS.

 src/plugins/welcome/gtd-welcome-action-card.ui |  4 ++++
 src/plugins/welcome/themes/shared.css          | 12 ------------
 2 files changed, 4 insertions(+), 12 deletions(-)
---
diff --git a/src/plugins/welcome/gtd-welcome-action-card.ui b/src/plugins/welcome/gtd-welcome-action-card.ui
index c91ca2bd..a859c17a 100644
--- a/src/plugins/welcome/gtd-welcome-action-card.ui
+++ b/src/plugins/welcome/gtd-welcome-action-card.ui
@@ -1,6 +1,10 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <interface>
   <template class="GtdWelcomeActionCard" parent="GtkButton">
+    <style>
+      <class name="activatable" />
+      <class name="card" />
+    </style>
 
     <child>
       <object class="GtkCenterBox">
diff --git a/src/plugins/welcome/themes/shared.css b/src/plugins/welcome/themes/shared.css
index da81db39..91ffbb45 100644
--- a/src/plugins/welcome/themes/shared.css
+++ b/src/plugins/welcome/themes/shared.css
@@ -13,27 +13,15 @@ welcome-workspace label.welcome-title {
 
 welcome-action-card {
   background-color: @theme_base_color;
-  border-radius: 5px;
   padding: 18px 24px;
-  border: solid 1px @borders;
   min-width: 142px;
   min-height: 142px;
 
   opacity: 1;
-  transition: all 150ms linear;
-}
-
-welcome-action-card:hover {
-  background-color: alpha(@theme_fg_color, 0.05);
-}
-
-welcome-action-card:active {
-  background-color: @theme_bg_color;
 }
 
 welcome-action-card.empty {
   opacity: 0.4;
-  transition: opacity 500ms linear;
 }
 
 welcome-action-card label.title {