Accept TOKEN_FOR_GITEA_WIKI in .env and move the token howto to the wiki

TOKEN_FOR_GITEA_WIKI is an optional key, checked and masked but never used
or asked for, so one .env can serve the wiki publishing too. GITHUB_PAT and
GITHUB_USER are documented as required only when GitHub is chosen.

The how-to for creating the access tokens moves from howto/ to the wiki as
AccessTokens in English, Danish and Bahasa Malaysia, with its pictures in
wiki/img/. README, Home and the sidebar link to it.

Adds MIL-010 with its review RC-033 and the matching plan, user story and
traceability rows.

Task: MIL-010#1
Task: MIL-010#2
Task: MIL-010#3
Closes #83
Closes #84
Closes #85

docs/artifact-registry.md

@@ -14,7 +14,7 @@ document of a type. `Primary File` may contain a glob (e.g.
 | BC | Business Case | docs/business-case.md | 002 |
 | SA | Stakeholder Analysis | docs/stakeholder-analysis.md | 002 |
 | PP | Project Plan | docs/project-plan.md | 002 |
-| MIL | Milestone / Gateway | docs/milestones/*.md | 010 |
+| MIL | Milestone / Gateway | docs/milestones/*.md | 011 |
 | US | User Story | docs/user-stories.md | 002 |
 | UC | Use Case | docs/uc-*/uc.md | 003 |
 | SSD | System Sequence Diagram | docs/uc-*/ssd.md | 003 |
@@ -24,7 +24,7 @@ document of a type. `Primary File` may contain a glob (e.g.
 | DCD | Design Class Diagram | docs/dcd.md | 004 |
 | DICT | Domain Dictionary (PO and IT terms) | docs/dictionary.md | 002 |
 | UCD | Use Case Diagram | docs/use-case-diagram.md | 002 |
-| RC | SQA Review Record | docs/sqa/reviews/rc-*.md | 033 |
+| RC | SQA Review Record | docs/sqa/reviews/rc-*.md | 034 |
 | TM | Traceability Matrix | docs/sqa/traceability-matrix.md | 002 |
 
 ## Languages