NX Section in main readme does not link to nx resource section

[ChandlerBaskins]

Need to edit main readme to include the link for the nx section. Could also edit https://github.com/Angular-community-collab/angular-study-guide/blob/main/topic-details/modular-apps.md to include internal resource as well.

[ChandlerBaskins]

A really good issue for someone starting to contribute to OSS 😄