broken links in document

**What happened:** high level design and sequence diagrams cannot be loaded in the https://github.com/fidelity/kconnect/blob/main/docs/proposals/20200607-initial-design.md document. **What did you expect to happen:** The two diagrams are visible in the document. **How to reproduce it:** The two diagrams are not showing in the Proposal/Design section of this document - https://github.com/fidelity/kconnect/blob/main/docs/proposals/20200607-initial-design.md **Anything else you would like to add:** **Environment:** - kconnect version (use `kconnect version`): - Kubernetes version (use `kubectl version`): - OS (e.g. from `/etc/os-release`): - Target environment (e.g. EKS, AKS, Rancher): - Authentication Used (e.g. SAML, IAM, Azure AD):