[#1559] Added DrupalSouth 2025 presentation link to README and docs introduction.

Author: AlexSkrypnyk

.vortex/docs/content/README.mdx

@@ -35,6 +35,10 @@ Every change is verified through automated tests to ensure updates remain stable
 and reliable — reducing the risk of regressions and making it easier to maintain
 projects over time.
 
+Learn more about Vortex from our [DrupalSouth 2025 presentation](https://docs.google.com/presentation/d/e/2PACX-1vQMBTteMr6cALYGtI3xwqvt9HFpzSzTsV3ie5qhVMPK5eSZBudyQp7H1_Wfoy7HMYqfgN2ooH4rlWJL/pub?start=false&loop=false&delayms=5000)
+([Google Slides](https://docs.google.com/presentation/d/1nsFfd9C_ddKD5O0sQeJ8_6pJjU0XWaXXwDmD0SwCIL4/) |
+[PDF](https://docs.google.com/presentation/d/1nsFfd9C_ddKD5O0sQeJ8_6pJjU0XWaXXwDmD0SwCIL4/export/pdf)).
+
 ## Why Vortex exists
 
 Setting up Drupal projects can be time-consuming and inconsistent:

README.md

@@ -30,10 +30,14 @@ platforms. Everything is pre-configured and ready to use, so teams can focus on
 building features instead of setting up infrastructure.
 
 By standardizing project structure and tooling, **Vortex** ensures a consistent
-developer experience across every project that uses it. Whether you’re starting
+developer experience across every project that uses it. Whether you're starting
 fresh or joining an existing Vortex-based site, you can get up to speed quickly
 and start contributing right away.
 
+Learn more about Vortex from our [DrupalSouth 2025 presentation](https://docs.google.com/presentation/d/e/2PACX-1vQMBTteMr6cALYGtI3xwqvt9HFpzSzTsV3ie5qhVMPK5eSZBudyQp7H1_Wfoy7HMYqfgN2ooH4rlWJL/pub?start=false&loop=false&delayms=5000)
+([Google Slides](https://docs.google.com/presentation/d/1nsFfd9C_ddKD5O0sQeJ8_6pJjU0XWaXXwDmD0SwCIL4/) |
+[PDF](https://docs.google.com/presentation/d/1nsFfd9C_ddKD5O0sQeJ8_6pJjU0XWaXXwDmD0SwCIL4/export/pdf)).
+
 Vortex is designed for ongoing use, not just initial project setup. Sites built
 with Vortex should regularly adopt upstream updates, keeping projects current
 with evolving tools, infrastructure, and best practices while minimizing upgrade