Merge pull request #63 from alexmerlin/issue-59-docs

Moved `v1` documentation files from `docs/book` to `docs/book/v1/`

Author: gsteel

docs/book/installation.md docs/book/v1/installation.md

@@ -2,16 +2,28 @@ docs_dir: docs/book
 site_dir: docs/html
 nav:
     - Home: index.md
-    - Introduction: intro.md
-    - Installation: installation.md
-    - Usage:
-      - "Session Containers": session.md
-      - "Session Persistence": persistence.md
-      - "Session Middleware": middleware.md
+    - v1:
+        - Introduction: v1/intro.md
+        - Installation: v1/installation.md
+        - Usage:
+            - "Session Containers": v1/session.md
+            - "Session Persistence": v1/persistence.md
+            - "Session Middleware": v1/middleware.md
 site_name: mezzio-session
 site_description: 'Sessions and session middleware for PSR-7 applications.'
 repo_url: 'https://github.com/mezzio/mezzio-session'
 extra:
     project: Mezzio
     installation:
         config_provider_class: 'Mezzio\Session\ConfigProvider'
+    current_version: v1
+    versions:
+      - v1
+plugins:
+    - redirects:
+        - redirect_maps:
+            - intro.md: v1/intro.md
+            - installation.md: v1/installation.md
+            - session.md: v1/session.md
+            - persistence.md: v1/persistence.md
+            - middleware.md: v1/middleware.md