fix: ignore test fixtures

mentioned in commit 06e7f2f2

mentioned in merge request demo!107 (merged)

mentioned in merge request cypress-html-validate!102 (merged)

mentioned in merge request eslint-config!137 (merged)

mentioned in merge request semantic-release-config!95 (merged)

mentioned in merge request html-validate-jest-snapshot!84 (merged)

mentioned in merge request html-validate-vue!135 (merged)

mentioned in merge request html-validate!677 (merged)

mentioned in merge request html-validate-angular!105 (merged)