edited about page

Figures generated using "display_content.py" from StatProofBookTools are now displayed on the About page.

Author: JoramSoch

about.md

@@ -12,30 +12,30 @@ permalink: /about/
 
 Unless otherwise noted, all content on this website is licensed under the ![CC-BY-SA compact icon](https://licensebuttons.net/l/by-sa/4.0/80x15.png) [Creative Commons Attribution-ShareAlike 4.0 International Public License](https://creativecommons.org/licenses/by-sa/4.0/legalcode). Read the [license summary](https://creativecommons.org/licenses/by-sa/4.0/) for more details.
 
-<table style="border:none; width:100%">
-  <tr>
+<table style="border:none; width:100%; background:white">
+  <tr style="background:white">
     <td style="text-align:center">
       <a href="https://github.com/StatProofBook/StatProofBookTools/blob/master/display_content/Content.png">
-        <img src="https://raw.githubusercontent.com/StatProofBook/StatProofBookTools/master/display_content/Content.png">
+        <img src="https://raw.githubusercontent.com/StatProofBook/StatProofBookTools/master/display_content/Content.png" alt="Content by Type">
       </a>
     </td>
     <td style="text-align:center">
       <a href="https://github.com/StatProofBook/StatProofBookTools/blob/master/display_content/Development.png">
-        <img src="https://raw.githubusercontent.com/StatProofBook/StatProofBookTools/master/display_content/Development.png">
+        <img src="https://raw.githubusercontent.com/StatProofBook/StatProofBookTools/master/display_content/Development.png" alt="Development over Time">
       </a>
     </td>
   </tr>
-  <tr>
+  <tr style="background:white">
     <td colspan="2" style="text-align:center">
       <a href="https://github.com/StatProofBook/StatProofBookTools/blob/master/display_content/Topic_Definitions.png">
-        <img style="width:100%" src="https://raw.githubusercontent.com/StatProofBook/StatProofBookTools/master/display_content/Topic_Definitions.png">
+        <img style="width:100%" src="https://raw.githubusercontent.com/StatProofBook/StatProofBookTools/master/display_content/Topic_Definitions.png" alt="Definitions by Topic">
       </a>
     </td>
   </tr>
-  <tr>
+  <tr style="background:white">
     <td colspan="2" style="text-align:center">
       <a href="https://github.com/StatProofBook/StatProofBookTools/blob/master/display_content/Topic_Proofs.png">
-        <img style="width:100%" src="https://raw.githubusercontent.com/StatProofBook/StatProofBookTools/master/display_content/Topic_Proofs.png">
+        <img style="width:100%" src="https://raw.githubusercontent.com/StatProofBook/StatProofBookTools/master/display_content/Topic_Proofs.png" alt="Proofs by Topic">
       </a>
     </td>
   </tr>