Clarify default behavior in deep linking documentation

[Ryandaydev]

A suggested clarification in the repo documentation (deep-linking.md).

The page says deep linking is disabled by default. That is true of the javascript itself. However, the /dist/index.html enables it, so if someone uses the /dist folder as-is, it will be enabled by default.

Suggest changing this statement to the Usage section:

Add deepLinking: true to your Swagger-UI configuration to enable this functionality.

To this:

Add deepLinking: true to your Swagger-UI configuration to enable this functionality. This is demonstrated in the /dist/index.html file.