Link model documentation to package READMEs

[divine7022]

The book's model pages (05_models) should link to their corresponding package READMEs and pkgdown documentation, similar to how ED2's page already links to external resources.

Current state:

• Most model pages have empty metadata tables and no links to package documentation
• The model index lists 13 models but 7 additional packages exist without book entries (basgra, cable, dvmdostem, fates, jules, maat, sibcasa)
• Some READMEs contain useful content not reflected in the book (e.g. JULES and CABLE have installation guides, MAAT has author/citation info)

Proposed changes:

1. Add links to each model page pointing to:

   • Package README on github
   • Pkgdown function reference
   • External model homepage where applicable

2. Update model index to include all supported models

3. Fill in metadata tables (Home Page, Source Code, License, Authors) -- much of this info exists in READMEs or can be derived from DESCRIPTION files

Side note: two READMEs (linkages and sibcasa) still contain the generic template text rather than package specific content.

[ayushman1210]

Hey @divine7022 i would like to work on this issue please aasign it to me thanks !!

[man080107]

Hi @divine7022 , I’m interested in working on this issue!!