Align the top of the README with mulgadc.com: new headline and intro,
rewritten "What is Spinifex?", a new "Three ways to deploy" section
(Neocloud / on-premise / edge) and a new "AWS compatibility" service
matrix (EC2, EBS, S3, VPC, IAM, ALB/NLB, EKS, ECR, ECS available; RDS
Q3 2026) linking the GitHub releases. Refresh the architecture prose and
Key Features, add Deploy and AWS-services nav links, and swap banner.svg
for the ember-on-ink mini-stack design matching platform.svg.