[SITE] Move to using pipes for js and scss

[mattstratton]

This is a pretty big change; this moves all the SCSS and javascript contcat logic into Hugo Pipes and removes the gulp depenendency

this means taht anyone can now make CSS changes using SCSS easily

this requires testing :)

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[github-actions]

Error: Mixed case filenames found

This can cause problems because git and Linux are case sensistive. Please rename the following to lowercase-with-dashes:

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❌ Makefile	→	makefile

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[github-actions]

Error: Mixed case filenames found

This can cause problems because git and Linux are case sensistive. Please rename the following to lowercase-with-dashes:

Actual Path		Suggested Valid Path
❌ Makefile	→	makefile

Please rename the files, commit and push again.