chore(docs): update mermaid diagram (#5115)

utils/helm/speckle-server/schematic.md

@@ -3,6 +3,7 @@
 ```mermaid
 graph LR;
  client([client])-->|Ingress-managed <br> load balancer|ingress[Ingress];
+ client-->|via pre-signed URLs <br> generated by Speckle server|blobstore;
  helmrepo["Speckle Helm Chart <br> Repository"]
  click helmrepo "https://specklesystems.github.io/helm/" _blank
  imageregistry["Speckle OCI <br> Image Registry <br> (DockerHub)"]
@@ -45,10 +46,10 @@ graph LR;
  backend-->authprovider;
 
  subgraph externalDependencies["Dependencies <br> (May be external or internal to cluster.)"]
+ blobstore[s3-compatible <br> blob storage];
  postgres[Postgres];
  redis[Redis];
- blobstore[s3-compatible <br> blob storage];
- emailserver["Transactional email <br> server (optional)"];
+ emailserver["Transactional email server"];
  authprovider["Authentication provider <br> (optional)"];
  end
  classDef plain fill:#ddd,stroke:#fff,stroke-width:4px,color:#000;