chore: 🤖 Upgrade version of doctoc

Upgrade version of doctoc and update some readme files in the process.

ui/desktop/README.md

@@ -10,8 +10,9 @@ The client UI for Boundary.
 - [Installation](#installation)
 - [Yarn Commands](#yarn-commands)
 - [Running / Development](#running--development)
-  - [Building for Production](#building-for-production)
     - [Environment Variables](#environment-variables)
+  - [Building for Production](#building-for-production)
+    - [Environment Variables](#environment-variables-1)
   - [Running Tests](#running-tests)
   - [Deploying](#deploying)
 - [Further Reading / Useful Links](#further-reading--useful-links)