Updating /docs/_config.yml to include logo, title, and description for GitHub Pages

Signed-off-by: Lucas A. Wilson <luke.wilson@dell.com>

docs/_config.yml

@@ -1 +1,4 @@
-theme: jekyll-theme-minimal
+theme: jekyll-theme-minimal
+title: Omnia
+description: Ansible playbook-based tools for deploying Slurm and Kubernetes clusters for High Performance Computing, Machine Learning, Deep Learning, and High-Performance Data Analytics
+logo: images/omnia-logo.png