Remove HTML template overrides, CSS files, and custom directives (backport #28)

[mergify[bot]]

This is an automatic backport of pull request #28 done by Mergify.

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[coveralls]

Pull Request Test Coverage Report for Build 4992834674

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 69.697%

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Totals
Change from base Build 4992772505:	0.0%
Covered Lines:	69
Relevant Lines:	99

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💛 - Coveralls

[mrossinek]

@Mergifyio update

[mergify[bot]]

update

✅ Branch has been successfully updated

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
1 out of 2 committers have signed the CLA.

:white_check_mark: Eric-Arellano
:x: mergify[bot]
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
1 out of 2 committers have signed the CLA.

:white_check_mark: Eric-Arellano
:x: mergify[bot]
_{You have signed the CLA already but the status is still pending? Let us recheck it.}