Changes to the header_footer.js filename

[StellaWanja]

Fixes #9146 (<=== Add issue number here)

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Code Climate has analyzed commit 9bf04ed and detected 0 issues on this pull request.

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Codecov Report

❗ No coverage uploaded for pull request base (main@c705479). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #9156   +/-   ##
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  Coverage        ?   82.00%           
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  Files           ?      100           
  Lines           ?     5931           
  Branches        ?        0           
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  Hits            ?     4864           
  Misses          ?     1067           
  Partials        ?        0           

[noi5e]

@StellaWanja Looks great, great job! This one is ready to merge.

[cesswairimu]

Thanks @StellaWanja for working on this 🎉 and welcome to PublicLab 🎈 and many thanks to @gauravahlawat81 and @noi5e for the reviews 🎉 🎉 .merging now

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