Add plain-language concept docs; fix docs viewer rendering; link API tokens

- New docs/concepts-{accounts,oauth-apps,api-tokens}.md -- plain-language
  guides aimed at less technical readers, each linking onward to the
  existing schema/protocol-level doc for anyone who wants that detail.
  Card help links (Users, Groups, OAuth cards, My groups, Members of
  <uid>'s group) now point here instead of straight at the technical
  docs; the LDAP-protocol-wiring cards (raw connection details for
  connecting a 3rd-party app) stay pointed at the technical ldap.md,
  since that's genuinely the right depth for that task.
- The "New API Token" card had no help link at all -- added, pointing to
  the new API Tokens doc.
- Fixed the in-app docs viewer rendering every docs/*.md page with a
  garbled heading + stray <hr> at the top: Jekyll front matter (meant
  only for the GitHub Pages build) was never stripped before being
  handed to the markdown renderer. Also fixed: cross-doc links
  (ldap.html, index.html, etc.) never resolved in-app, since this
  viewer serves docs at /docs/<slug> with no .html suffix -- rewritten
  to the correct in-app URL, same idea as the existing image-path fix.

Bumps to v1.1.12.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01KDEx8ghuZR61pqPXc6da9C

docs/concepts-api-tokens.md

@@ -0,0 +1,59 @@
+---
+layout: default
+title: API Tokens
+description: A plain-language guide to personal access tokens in SSO Manager.
+---
+
+# API Tokens
+
+This page explains what an API token is and when you'd want one. For the
+full list of API endpoints a token can call, see the
+[API reference](api.html).
+
+## What's an API token, in plain terms?
+
+Normally, you interact with this app by logging in through a web browser.
+An **API token** (also called a personal access token, or PAT) is an
+alternative way in — a long, random string that a script, a scheduled job,
+or another program can use instead of a username and password, to act on
+your behalf without a human typing a login in each time.
+
+If you've ever set up a script to talk to GitHub, GitLab, or a similar
+service using a "token" instead of your real password, this is the same
+idea.
+
+## When would you actually need one?
+
+Most people never need to create one of these — you'll only want a token
+if you're automating something, for example:
+
+- A script that syncs users or groups from somewhere else into this SSO
+  Manager on a schedule.
+- A backup or monitoring job that checks this app's health via its API.
+- A CI/CD pipeline that needs to register or update an OAuth client
+  automatically.
+
+If you're not doing any of that, you don't need an API token — just log in
+normally through the web UI.
+
+## How it works
+
+Create a token from your Profile page, give it a name so you remember what
+it's for later, and optionally an expiry. You'll be shown the token's
+value **exactly once** — copy it somewhere safe immediately, because it
+can't be viewed again afterward (only revoked or rotated). Whatever script
+or tool you're using it with sends it along with each request, the same
+way a browser sends your login session.
+
+A token acts **as you**, with **your** permissions — if you're not an
+admin, a token you create can't do admin-only things either. If you ever
+suspect a token has leaked (ended up somewhere it shouldn't have, like a
+public script or log file), revoke it immediately from your Profile page;
+it stops working right away.
+
+## Want more detail?
+
+This page doesn't attempt to list every API endpoint or show request/
+response examples — for that, see the full [API reference](api.html).
+
+[← Back to Home](index.html)