git: openjdk/amber-docs: Rationalize stylesheet usage

[duke]

Changeset: 751214a8
Author:    briangoetz <brian at briangoetz.com>
Date:      2021-05-14 12:02:39 +0000
URL:       https://git.openjdk.java.net/amber-docs/commit/751214a8de45d261a7fa68689a955315606daf55

Rationalize stylesheet usage

! Makefile
! etc/style.css
! site/guides/text-blocks-guide.md