Added .md extension to links in toc.md file

content/toc.md

@@ -1,38 +1,38 @@
 The Twelve Factors
 ==================
 
-## [I. Codebase](./codebase)
+## [I. Codebase](./codebase.md)
 ### One codebase tracked in revision control, many deploys
 
-## [II. Dependencies](./dependencies)
+## [II. Dependencies](./dependencies.md)
 ### Explicitly declare and isolate dependencies
 
-## [III. Config](./config)
+## [III. Config](./config.md)
 ### Store config in the environment
 
-## [IV. Backing services](./backing-services)
+## [IV. Backing services](./backing-services.md)
 ### Treat backing services as attached resources
 
-## [V. Build, release, run](./build-release-run)
+## [V. Build, release, run](./build-release-run.md)
 ### Strictly separate build and run stages
 
-## [VI. Processes](./processes)
+## [VI. Processes](./processes.md)
 ### Execute the app as one or more stateless processes
 
-## [VII. Port binding](./port-binding)
+## [VII. Port binding](./port-binding.md)
 ### Export services via port binding
 
-## [VIII. Concurrency](./concurrency)
+## [VIII. Concurrency](./concurrency.md)
 ### Scale out via the process model
 
-## [IX. Disposability](./disposability)
+## [IX. Disposability](./disposability.md)
 ### Maximize robustness with fast startup and graceful shutdown
 
-## [X. Dev/prod parity](./dev-prod-parity)
+## [X. Dev/prod parity](./dev-prod-parity.md)
 ### Keep development, staging, and production as similar as possible
 
-## [XI. Logs](./logs)
+## [XI. Logs](./logs.md)
 ### Treat logs as event streams
 
-## [XII. Admin processes](./admin-processes)
+## [XII. Admin processes](./admin-processes.md)
 ### Run admin/management tasks as one-off processes