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

wiki/_Sidebar.md

@@ -5,6 +5,7 @@
 - [Home](Home)
 - [Getting started](GettingStarted)
 - [SSH and tokens](SshAndTokens)
+- [Access tokens](AccessTokens)
 - [Updating the framework](UpdatingTheFramework)
 - [Troubleshooting](Troubleshooting)
 
@@ -13,6 +14,7 @@
 - [Hjem](Home.da)
 - [Kom godt i gang](GettingStarted.da)
 - [SSH og tokens](SshAndTokens.da)
+- [Adgangstokens](AccessTokens.da)
 - [Opdatering af frameworket](UpdatingTheFramework.da)
 - [Fejlfinding](Troubleshooting.da)
 
@@ -21,5 +23,6 @@
 - [Utama](Home.ms)
 - [Bermula](GettingStarted.ms)
 - [SSH dan token](SshAndTokens.ms)
+- [Token akses](AccessTokens.ms)
 - [Mengemas kini framework](UpdatingTheFramework.ms)
 - [Diagnosis](Troubleshooting.ms)