design: change info columns into cards

Author: tfuxu

images/pillow-logo-248x250.png

@@ -90,7 +90,7 @@ <h1 class="display-6 fw-bold">Pillow</h1>
                 </div>
                 <div class="row">
                     <div class="col-md-12">
-                        <div class="p-4 mb-4 text-center">
+                        <div class="p-4 mb-3 text-center">
                             <h2>
                                 <a target="_blank"
                                    class="text-decoration-none text-dark"
@@ -99,33 +99,39 @@ <h2>
                         </div>
                     </div>
                 </div>
-                <div class="row align-items-md-stretch">
-                    <div class="col-md-4">
-                        <div class="h-100 p-5 bg-dark text-light rounded-3">
-                            <h2>Documentation</h2>
-                            <p>
-                                Our <a target="_blank" href="https://pillow.readthedocs.io/">documentation</a> is hosted by Read the Docs and includes 
-                                    <a target="_blank" href="https://pillow.readthedocs.io/en/stable/installation.html">installation instructions</a>, 
-                                    <a target="_blank" href="https://pillow.readthedocs.io/en/stable/handbook/index.html">handbook</a>, 
-                                    <a target="_blank" href="https://pillow.readthedocs.io/en/stable/reference/index.html">API reference</a> and 
-                                    <a target="_blank" href="https://pillow.readthedocs.io/en/stable/releasenotes/index.html">release notes</a>.
-                            </p>
+                <div class="row row-cols-1 row-cols-lg-3 g-4">
+                    <div class="col">
+                        <div class="card h-100 p-4 bg-dark text-light rounded-3">
+                            <div class="card-body">
+                                <h2 class="card-title">Documentation</h2>
+                                <p class="card-text">
+                                    Our <a target="_blank" href="https://pillow.readthedocs.io/">documentation</a> is hosted by Read the Docs and includes 
+                                        <a target="_blank" href="https://pillow.readthedocs.io/en/stable/installation.html">installation instructions</a>, 
+                                        <a target="_blank" href="https://pillow.readthedocs.io/en/stable/handbook/index.html">handbook</a>, 
+                                        <a target="_blank" href="https://pillow.readthedocs.io/en/stable/reference/index.html">API reference</a> and 
+                                        <a target="_blank" href="https://pillow.readthedocs.io/en/stable/releasenotes/index.html">release notes</a>.
+                                </p>
+                            </div>
                         </div>
                     </div>
-                    <div class="col-md-4">
-                        <div class="h-100 p-5 bg-white border rounded-3">
-                            <h2>Discussion</h2>
-                            <p>
-                                Discussion about Pillow development, programming and technical issues occurs on 
-                                <a target="_blank" href="https://github.com/python-pillow/Pillow/issues">GitHub</a>, 
-                                <a target="_blank" href="https://stackoverflow.com/questions/tagged/python-imaging-library">Stack Overflow</a> and 
-                                <a target="_blank" href="https://gitter.im/python-pillow/Pillow">Gitter</a>.
+                    <div class="col">
+                        <div class="card h-100 p-4 bg-white border rounded-3">
+                            <div class="card-body">
+                                <h2 class="card-title">Discussion</h2>
+                                <p class="card-text">
+                                    Discussion about Pillow development, programming and technical issues occurs on 
+                                    <a target="_blank" href="https://github.com/python-pillow/Pillow/issues">GitHub</a>, 
+                                    <a target="_blank" href="https://stackoverflow.com/questions/tagged/python-imaging-library">Stack Overflow</a> and 
+                                    <a target="_blank" href="https://gitter.im/python-pillow/Pillow">Gitter</a>.
+                                </p>
                             </div>
                         </div>
-                        <div class="col-md-4">
-                            <div class="h-100 p-5 bg-dark text-light rounded-3">
-                                <h2>Source Code</h2>
-                                <p>
+                    </div>
+                    <div class="col">
+                        <div class="card h-100 p-4 bg-dark text-light rounded-3">
+                            <div class="card-body">
+                                <h2 class="card-title">Source Code</h2>
+                                <p class="card-text">
                                     Our <a target="_blank" href= "https://github.com/python-pillow/Pillow">source code</a> is hosted by GitHub and tested on 
                                         <a target="_blank" href="https://github.com/python-pillow/Pillow/actions">GitHub Actions</a>, 
                                         <a target="_blank" href="https://ci.appveyor.com/project/python-pillow/Pillow">AppVeyor</a>, 
@@ -136,6 +142,7 @@ <h2>Source Code</h2>
                             </div>
                         </div>
                     </div>
+                </div>
                     <div class="h-100 p-5 rounded-3 text-center bg-white rounded-3 border my-5">
                         <h2 class="py-5">For Enterprise</h2>
                         <img class="img-fluid" src="images/Tidelift_primary-logo.png">