fix: Point Pajamas anchors to main branch

mentioned in commit 68de97c3

mentioned in merge request gitlab!59473 (merged)

mentioned in merge request status-page!272 (merged)

mentioned in merge request gitlab!59492 (merged)

mentioned in merge request gitlab-docs!1704 (merged)

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!2340 (merged)

mentioned in merge request gitlab-org/gitlab-services/design.gitlab.com!2347 (merged)

mentioned in merge request status-page!275 (merged)

mentioned in merge request gitlab-docs!1734 (merged)

mentioned in commit 876590b8