improve route for home page #1233

[joshuadkitenge]

Description

This needs to be done as all declared routes on scigateway needs to have there 404n managed by the plugin

Testing instructions

Add a set up instructions describing how the reviewer should test the code

• Review code
• Check Actions build
• Review changes to test coverage
• {more steps here}

Agile board tracking

closes #1233

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.11%. Comparing base (df22100) to head (05dad65).
Report is 13 commits behind head on develop.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1234   +/-   ##
========================================
  Coverage    99.11%   99.11%           
========================================
  Files           96       96           
  Lines        17549    17563   +14     
  Branches      2993     2994    +1     
========================================
+ Hits         17394    17408   +14     
- Misses         151      154    +3     
+ Partials         4        1    -3     

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The base branch was changed.