docs: switch to ascii for diagram

Author: sgtoj

README.md

@@ -214,21 +214,21 @@ CMD ["/server"]
 ## How It Works
 
 ```
-┌────────────┐     ┌─────────────────────────────────────┐     ┌────────────┐
-│   GitHub   │────▶│           github-ops-app            │────▶│   Slack    │
-│  webhooks  │     │                                     │     │   alerts   │
-└────────────┘     │  ┌───────────────────────────────┐  │     └────────────┘
-                   │  │  PR Compliance Check          │  │
-┌────────────┐     │  │  • Verify branch protection   │  │     ┌────────────┐
-│    Okta    │────▶│  │  • Detect bypasses            │  │────▶│   GitHub   │
-│   groups   │     │  └───────────────────────────────┘  │     │  Teams API │
-└────────────┘     │                                     │     └────────────┘
-                   │  ┌───────────────────────────────┐  │
-                   │  │  Okta Sync Engine             │  │
-                   │  │  • Map groups to teams        │  │
-                   │  │  • Sync membership            │  │
-                   │  └───────────────────────────────┘  │
-                   └─────────────────────────────────────┘
++------------+      +------------------------------------+      +-----------+
+|  GitHub    | ---> |           github-ops-app           | ---> |   Slack   |
+|  webhooks  |      |                                    |      |  alerts   |
++------------+      |  +------------------------------+  |      +-----------+
+                    |  |     PR Compliance Check      |  |
++------------+      |  |  - verify branch protection  |  |      +-----------+
+|    Okta    | ---> |  |  - detect bypasses           |  | ---> |  GitHub   |
+|   groups   |      |  +------------------------------+  |      | Teams API |
++------------+      |                                    |      +-----------+
+                    |  +------------------------------+  |
+                    |  |      Okta Sync Engine        |  |
+                    |  |  - map groups to teams       |  |
+                    |  |  - sync membership           |  |
+                    |  +------------------------------+  |
+                    +------------------------------------+
 ```
 
 ### Okta Sync Flow