Add Iceland to the list of deployments [ci skip]

[t2gran]

Summary

This add the Iceland (nationwide) travelplanner to the list of deployments. They are currently using OTP 1, but have plans to migrate to OTP 2. They have used OTP since 2015.

Issue

Not relevant.

Unit tests

Not relevant.

Documentation

✅ Deployment doc updated

Changelog

Not relevant

Bumping the serialization version id

Not relevant

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.78%. Comparing base (c00ea1e) to head (e55b7cc).
Report is 12 commits behind head on dev-2.x.

Additional details and impacted files

@@            Coverage Diff             @@
##             dev-2.x    #6057   +/-   ##
==========================================
  Coverage      69.78%   69.78%           
- Complexity     17356    17357    +1     
==========================================
  Files           1962     1962           
  Lines          74359    74359           
  Branches        7624     7624           
==========================================
+ Hits           51892    51895    +3     
+ Misses         19823    19821    -2     
+ Partials        2644     2643    -1     

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