fixed the service unavaliable page href

[Zuhal-Ayob]

Work done

• fix the href for service unavailable

Tests

Does this PR include tests for the changes introduced?

• Yes
• No, I found it difficult to test
• No, they are not required for this change

[codeclimate]

Code Climate has analyzed commit 5042677 and detected 0 issues on this pull request.

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[sbt92]

LGTM

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.50%. Comparing base (1b362a9) to head (5042677).
Report is 876 commits behind head on test.

❗ There is a different number of reports uploaded between BASE (1b362a9) and HEAD (5042677). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (1b362a9)	HEAD (5042677)
	2	1

Additional details and impacted files

@@            Coverage Diff             @@
##             test    #6028      +/-   ##
==========================================
- Coverage   53.04%   43.50%   -9.54%     
==========================================
  Files        1151      455     -696     
  Lines       37924    18513   -19411     
  Branches     4681        0    -4681     
==========================================
- Hits        20116     8055   -12061     
+ Misses      13815    10458    -3357     
+ Partials     3993        0    -3993     

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