Update enum values for OpenHIM Apps type

[medchedli]

This pull request proposes modifying the Apps schema's type attribute to:

• New enum values: Replace ['link', 'embedded'] with ['internal', 'external', 'esmodule'].

However, I'd like to open a discussion about alternative naming options :

• built-in : OpenHIM Console core module or internal pages
• shortcut: link to an external web page or app
• in-browser-module: link to one of Jembi's or third-party bundled ESModules

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (0ef8191) 86.78% compared to head (60cdd8c) 86.76%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1216      +/-   ##
==========================================
- Coverage   86.78%   86.76%   -0.02%     
==========================================
  Files          89       89              
  Lines        6024     6024              
==========================================
- Hits         5228     5227       -1     
- Misses        796      797       +1     

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[rcrichton]

Sounds good to me. I have no problem with these new names.

[drizzentic]

LGTM!