chore(showcase): Add dispel.io to showcase (#20038)

* adds Dispel to sites.yml

* adds security as category

* fix indent issue

docs/sites.yml

@@ -8912,3 +8912,15 @@
     - Food
     - Sports
   featured: false
+- title: Dispel - Remote Access for Industrial Control Systems
+  url: https://dispel.io
+  main_url: https://dispel.io
+  description: >
+    Dispel provides secure, moving target defense networks through which your teams can remotely access industrial control systems in seconds, replacing static-defense products that take 5 to 15 minutes to work through.
+  categories:
+    - Business
+    - Technology
+    - Security
+  built_by: Anton Aberg
+  built_by_url: https://github.com/aaaberg
+  featured: false