remove "informational" status of HTML validation once HTML is expected to validate :-)

[cfm]

Description

This is a reminder to remove the "informational" status of the HTML validation introduced in #6072...once HTML can be expected to validate on develop and we want to hold contributors' pull requests to that standard.

securedrop/.circleci/config.yml

Lines 108 to 112 in 2ed9fce

	# Once HTML can be expected to validate, remove "|| true" and
	# "informational" status---in other words, fail if validation fails!
	- run:
	name: Validate HTML (informational)
	command: make validate-test-html || true

[cfm]

We should revisit this question especially in light of html5validator's dependency on a JDK and https://github.com/validator/validator. The latter in turn depends on Log4j, albeit a version prior to those vulnerable to the Log4shell exploits.