Remove inline JS from body [#1185]

[Leeiaisabelle]

Remove inline JavaScript from body and added <script> in header for external Javascript in ./js/select.js/

Fixes: #1185

Fixes #0000 (<=== Add issue number here)

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[gitpod-io]

[TildaDares]

Hi @Leeiaisabelle, the changes in this PR AND #1254 should be in a single PR. Thanks!

[cesswairimu]

Thanks for attempting this @Leeiaisabelle , it was jointly resolved on #1291, Closing this