move the update guides from the wiki into the repo

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diff --git a/doc/update/4.0-to-4.1.md b/doc/update/4.0-to-4.1.md
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+# From 4.0 to 4.1
+
+## Important changes
+
+* Resque replaced with Sidekiq
+* New options for configuration file added
+* Init.d script should be updated
+* __requires ruby1.9.3-p327__
+
+- - -
+
+### 1. Stop GitLab & Resque
+
+    sudo service gitlab stop
+
+### 2. Update GitLab
+
+```bash
+
+# Get latest code
+sudo -u gitlab -H git fetch
+sudo -u gitlab -H git checkout 4-1-stable
+
+# Install gems for MySQL
+sudo -u gitlab -H bundle install --without development test postgres
+
+# Migrate db
+sudo -u gitlab -H bundle exec rake db:migrate RAILS_ENV=production
+
+```
+
+### 3. Replace init.d script with a new one
+
+```
+# backup old one
+sudo mv /etc/init.d/gitlab /etc/init.d/gitlab.old
+
+# get new one usign sidekiq
+sudo curl --output /etc/init.d/gitlab https://raw.github.com/gitlabhq/gitlab-recipes/4-1-stable/init.d/gitlab
+sudo chmod +x /etc/init.d/gitlab
+
+```
+
+### 4. Check GitLab's status
+
+    sudo -u gitlab -H bundle exec rake gitlab:check RAILS_ENV=production
+
+
+### 5. Start GitLab & Sidekiq
+
+    sudo service gitlab start
+
+### 6. Remove old init.d script
+
+    sudo rm /etc/init.d/gitlab.old