docs: better getting-started graph (#27)

* docs: better getting-started graph

* fix: broken links

Author: lorenzocorallo

docs/infrastructure/02-getting-started/basic-knowledge/index.md

@@ -14,16 +14,22 @@ Everything regarding the deployment of apps and services is divided into two rep
 
 ```mermaid
 flowchart TD
+  subgraph Github
+    tf([**terraform**])
+    cd([**polinetwork-cd**])
+  end
   subgraph Azure
+    vm[VMs and other resources]
     subgraph k8s[K8S cluster]
-      ArgoCD -.-> app[Apps and Services]
+      argocd[ArgoCD]
+      app@{ shape: processes, label: "Apps / Services" }
     end
-    vm[VMs and other resources] <--> k8s
   end
-  tf([*polinetworkorg*/**terraform**]) -.-> Azure
-  cd([*polinetworkorg*/**polinetwork-cd**]) <-.-> ArgoCD
+
   tf -.-> vm
   tf -.-> k8s
+  vm <--> k8s
+  cd <-.-> argocd --> app
 ```
 
 ### **Terraform: Definition and Purpose**