Added Mermaid code to replace image of product roadmap (#1984)

docs/enrollment-pathways/README.md

@@ -16,8 +16,58 @@ See our [Milestones][milestones] for current work tracked against specific featu
 
 See our Product Roadmap for more information on planned feature development and prioritization.
 
-![Cal-ITP Benefits Product Roadmap](img/roadmap.png)
+```mermaid
+timeline
+---
+title Cal-ITP Benefits Product Roadmap
+----
+%%{
+    init: {
+        'logLevel': 'debug',
+        'theme': 'default' ,
+        'themeVariables': {
+            'cScale0': '#ffa500', 'cScaleLabel0': '#000000',
+            'cScale1': '#ffff00', 'cScaleLabel1': '#000000',
+            'cScale2': '#ffff00', 'cScaleLabel2': '#000000',
+            'cScale3': '#008000', 'cScaleLabel3': '#ffffff',
+            'cScale4': '#0000ff', 'cScaleLabel4': '#ffffff',
+            'cScale5': '#4b0082', 'cScaleLabel5': '#ffffff',
+            'cScale6': '#000000', 'cScaleLabel6': '#ffffff'
+        }
+    }
+}%%
+%% Cal-ITP Benefits Epics (2024)
+          section 2024
+
+          Q1<br>Now
+          : Benefits admin tool (Foundation)
+          : SBMTD - Launch Mobility Pass enrollment pathway
+          : Release low-income riders enrollment pathway
+          : Migrate to Littlepay Backoffice API
+
+          Q2<br>Next
+          : Benefits admin tool (Agency configuration)
+          : Release enhancements to Veterans pathway
+          : Support for expiring benefits (low-income)
+
+          Q3<br>Planned
+          : Benefits admin tool (Agency users)
+          : Benefits admin tool (In-person eligibility verification)
+          : Release Medicare cardholder enrollment pathway
+
+          Q4<br>Planned
+          : Release riders with disabilities enrollment pathway
+
+%% Cal-ITP Benefits Epics (2025)
+          section 2025
+
+          Q1
+          : Support benefits reciprocity between CA transit agencies
+          : Implement evolved organizing principles for app UX
 
+          Q2
+          : Support for multiple payment processors
+          : Integration with all MSA payment processors
+```
 [board]: https://github.com/orgs/cal-itp/projects/8/views/1
 [milestones]: https://github.com/cal-itp/benefits/milestones
-[roadmap]: https://docs.google.com/document/d/1IFoa8Ye0IXwGXXwxFjMrm1s3617Dbv6l-E-aCB0kgnA/edit#