[create-a-wiki] Move old descriptions

Drop the guide *wiki-preview.mdwn*. The content is now fully covered
and updated in *create-a-wiki-preview.mdwn*
and *create-a-wiki/additional.mdwn*.

Also move the dated *create-a-wiki.mdwn*
-> *create-a-wiki/create-a-wiki.mdwn*. Closing that content needs more
attention.

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+This article describes mine (the author's, also known as Gustav)
+attempts to configure an Ikiwiki lab environment on my laptop
+computer. The purpose of the experiment is to learn how Ikiwiki
+functions and how to effectively work with Ikiwiki and offline editing
+with git.
+
+The components needed are
+
+  * Ikiwiki
+  * Apache2 or Nginx web server
+  * Git
+
+**Table of Contents**
+[[!toc]]
+
+What I have in mind is to access my lab wiki through
+`http://localhost/~<name>/lab-wiki` for web editing and
+`~/lab-wiki/wiki-slave` for local offline editing.
+
+It should be noted that what is described here probably is a perfectly
+_unsafe_ usage of a web server. Make sure that the computer does not
+except requests from Internet.
+
+
+Install and configure Git
+=========================
+
+I can not recall how this was done. Refer to
+[Git's official website](https://git-scm.com/)
+
+
+Install and configure Ikiwiki
+=============================
+
+Refer to [ikiwiki setup](https://ikiwiki.info/setup/) at
+[ikiwiki's official website](https://ikiwiki.info) for initial
+install and configuration and
+[an article on Git](https://ikiwiki.info/rcs/git/) for more details on
+setting up Ikiwiki together with Git.
+
+Install packages referred to in the ansible configuration:
+
+    sudo aptitude install \
+      ikiwiki \
+      libauthen-passphrase-perl \
+      highlight-common libhighlight-perl libimage-magick-perl \
+      libmail-sendmail-perl libnet-dns-sec-perl \
+      fcgiwrap spawn-fcgi \
+      pandoc
+
+I did my best to answer the questions provided in the initial
+installation and default configuration with the target of ending up
+with something like this:
+
+    url:         http://localhost/~<name>/lab-wiki
+    srcdir:      ~/lab-wiki/wiki
+    destdir:     ~/public_html/lab-wiki
+    repository:  ~/lab-wiki/wiki.git
+    settings:    ~/lab-wiki/wiki.setup
+
+However, not all of the above was configurable in the form, for
+example the configuration file location. I needed to move directories
+and files around and change the remaining configurations in
+`~/lab-wiki/wiki.setup` and run
+
+    $ ikiwiki --setup ~/lab-wiki/wiki.setup
+
+I also created the extra Git repository `wiki-slave` for local edits:
+
+    $ cd ~/lab-wiki; git clone wiki.git wiki-slave
+
+The connectivity chart is now as follows
+
+            Bare Git Repository
+            ~/lab-wiki/wiki.git
+                /         \
+               /           \
+              /             \
+    The Ikiwiki Repository  |
+      ~/lab-wiki/wiki       |
+              |             |
+              |    Repository for Local Edits
+              |     ~/lab-wiki/wiki-slave
+              |             |
+     The Ikiwiki Web Part   |
+    ~/public_html/lab-wiki  |
+                            |
+               The Preview Ikiwiki Web Part
+              ~/public_html/lab-wiki-preview
+
+
+Install and configure Apache 2
+==============================
+
+For installation, follow the instructions in
+[Apache's official documentation](https://httpd.apache.org/docs). I
+got Apache 2.4.6 installed.
+
+I needed to activate the userdir module. Refer to
+[Per-user web directories](https://httpd.apache.org/docs/2.4/howto/public_html.html)
+in Apache's documentation. For Debian do the following
+
+    $ cd /etc/apache2/mods-enabled
+    $ ln -s ln -s ../mods-available/userdir.load
+    $ ln -s ln -s ../mods-available/userdir.conf
+
+Also CGI execution need to be activated. See
+[Dynamic Content with CGI](https://httpd.apache.org/docs/2.4/howto/cgi.html)
+in Apache's documentation. My
+`/etc/apache2/mods-available/userdir.conf` now looks as follows
+
+    <IfModule mod_userdir.c>
+            UserDir public_html
+            UserDir /home/*/public_html
+            UserDir disabled root
+    
+            <Directory /home/*/public_html>
+                    AllowOverride FileInfo AuthConfig Limit Indexes
+                    Options MultiViews Indexes SymLinksIfOwnerMatch IncludesNoExec
+                    <Limit GET POST OPTIONS>
+                            Require all granted
+                    </Limit>
+                    <LimitExcept GET POST OPTIONS>
+                            Require all denied
+                    </LimitExcept>
+            </Directory>
+    
+            <Directory /home/*/public_html>
+                    Options +ExecCGI
+                    AddHandler cgi-script .cgi
+            </Directory>
+            <Directory /home/*/public_html/*>
+                    Options +ExecCGI
+                    AddHandler cgi-script .cgi
+            </Directory>
+    </IfModule>
+
+
+Install and conifgure Nginx
+===========================
+
+A valid web server alternative
+is
+[Nginx](http://nginx.org/en/docs/).
+
+For installation and configuration
+follow [Ikiwiki on Dot CGI](https://ikiwiki.info/tips/dot_cgi/). `sudo
+aptitude install nginx`. Note the alexjj comment that on
+Debian the package *fcgiwrap* automatically spwans the FastCGI
+program.
+
+
+
+Get preview of local modifications
+==================================
+
+Now every thing works as work as expected. I can fetch the latest
+updated to `wiki-slave`, perform my updates, and whenever those are
+pushed to `origin/master`, the post-update hook makes sure that the
+web version is updated.
+
+But what if I want to inspect and verify my local changes before
+pushing them to `origin/master`?
+
+The subject is covered in
+[the article on Git](https://ikiwiki.info/rcs/git/). I did what
+follows. Copy `wiki.setup` to `wiki-preview.setup` and edit those
+fields:
+
+    wikiname: lab-wiki-preview
+    srcdir: ~/lab-wiki/wiki-slave
+    destdir: ~/public_html/lab-wiki-preview
+    url: http://skolem/~<name>/lab-wiki-preview
+    cgiurl: http://skolem/~<name>/lab-wiki-preview/ikiwiki.cgi
+    cgi_wrapper: ~/public_html/lab-wiki-preview/ikiwiki.cgi
+    git_wrapper: ~/lab-wiki/wiki-slave/.git/hooks/post-commit
+    gitorigin_branch: ''
+    gitmaster_branch: master
+
+The idea is that the preview wiki works against `wiki-slave`, which is
+my simulated environment for local repository. What always works now
+is to, at any point, recompile/refresh the wiki:
+
+    ikiwiki -setup ~/lab-wiki/wiki-preview.setup -refresh
+
+Also, committing on the local `master` branch _should_ automatically
+update the `lab-wiki-preview` wiki.