Update speakers pages for John, Jared & Fred

Also update the branding to Konstruct.

README.md

@@ -1,13 +1,13 @@
-# Kubefirst Public Speaking Kit
+# Konstruct Public Speaking Kit
 
 <p align="center">
   <picture>
-    <source media="(prefers-color-scheme: dark)" srcset="https://github.com/kubefirst/speaking/blob/main/img/kubefirst-light.svg" alt="Kubefirst Logo">
-    <img alt="" src="https://github.com/kubefirst/speaking/blob/main/img/kubefirst.svg">
+    <source media="(prefers-color-scheme: dark)" srcset="https://github.com/konstructio/speaking/blob/main/img/konstruct-light.svg" alt="Kubefirst Logo">
+    <img alt="" src="https://github.com/konstructio/speaking/blob/main/img/konstruct.svg">
   </picture>
 </p>
 
-At Kubefirst we are passionate about what we do, it's why we love to share our experience, knowledge and expertise with the tech industry.
+At Konstruct we are passionate about what we do, it's why we love to share our experience, knowledge and expertise with the tech industry.
 
 We are open to speak at conferences, meetups, livestreams, webinars, and podcasts, online or offline.
 
@@ -17,3 +17,5 @@ Here are our public speakers, which have different experience in the industry, a
 - [Jared Edwards](speakers/jared.md), Technical Founder
 - [John Dietz](speakers/john.md), Technical Founder
 - [Simon Emms](speakers/simon.md), Senior Platform Engineer
+
+If you have any questions or requests, please contact [Frédéric Harper](mailto:[email protected]).