Move Javascript in /pages html files to External File

[omicreativedev]

Currently each of the files in the /pages folder has Javascript to switch the theme.
Move this code to /pages/themeswitcher_subdir.js
Update thankyou.html and omicreativedev.html with the external script

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[Creperi]

Me.

[omicreativedev]

@Creperi You are assigned.

[omicreativedev]

@Creperi
I saw your previous pull. Nice work.
You don't have to update index.html as it's already done.
We need to just do thankyou.html and omicreativedev.html
Instead of main.js we want to use ./themeswitcher_subdir.js as the filename

[Creperi]

Thanks. I was confused.

[Creperi]

Anyway i solved the issue