Reference Sway-Libs, Sway-Standards, and Sway-Applications In Sway Book

[bitzoic]

Description

Previously the Sway book did not have any sections on Sway-Libs, Sway-Standards, or Sway-Applications and was sparsely mentioned. Sections for each repository have been added with a brief overview of what they contain. Links to any app, standard, or library have also been provided.

Any use of the sway-libs repository has been replaced with the Sway-Libs book. This should eventually be replaced with a doc hub link when it has been integrated and the same for Sway-Apps and Sway-Libs.

Closes #5780

Checklist

• I have linked to any relevant issues.
• I have commented my code, particularly in hard-to-understand areas.
• I have updated the documentation where relevant (API docs, the reference, and the Sway book).
  • If my change requires substantial documentation changes, I have requested support from the DevRel team
• I have added tests that prove my fix is effective or that my feature works.
• I have added (or requested a maintainer to add) the necessary Breaking* or New Feature labels where relevant.
• I have done my best to ensure that my PR adheres to the Fuel Labs Code Review Standards.
• I have requested a review from the relevant team or maintainers.

[sarahschwartz]

nice! Just have a small nit, otherwise LGTM