Update documentation development environment instructions

docs/.gitignore

@@ -12,6 +12,8 @@ Thumbs.db
 .rbenv-version
 .rvmrc
 
+npm-debug.log
+
 addons
 CNAME
 

docs/README.md

@@ -1,22 +1,82 @@
-http://ace3mod.com/
+# Source of http://ace3mod.com/
 
-### How to install Jekyll on your local machine:
+## Setting up the development environment
 
-1. Install Ruby http://rubyinstaller.org/downloads/
-5. Install bundler gem: Open a CLI and run `gem install bundler`
-6. `cd` to the repo directory
-7. Execute `bundle install`
+### Installing prerequisites
 
-**To run Jekyll:**
+#### Windows (CMD)
 
-```powershell
-bundle exec jekyll serve --future --incremental --config _config_dev.yml
-```
-Then navigate to http://localhost:4000
+- Install [Ruby 2.0.0-p648 (x64)](http://rubyinstaller.org/downloads/)
+- Install [Ruby DevKit for 2.0 (x64)](http://rubyinstaller.org/downloads/)
+- Open Command Prompt and navigate to this directory
+    ```
+    cd <ACE3_directory>/docs
+    ```
+- Install `bundler` gem
+    ```
+    gem install bundler
+    ```
+- Install required gems through `bundler`
+    ```
+    bundle install
+    ```
 
-### How to update the compiled Javascript and CSS files
+#### Debian / Bash on Ubuntu on Windows
 
-1. Install Node.js: https://nodejs.org/download/
-2. Open a CLI and `cd` to the `src` directory
-3. Run `npm install`
-4. Run `grunt`
+- Open Bash and navigate to this directory
+    ```
+    cd <ACE3_directory>/docs
+    ```
+- Install `make` and `gcc`
+    ```
+    sudo apt-get make gcc
+    ```
+- Install `ruby 2.0`, `rbuy2.0-dev` and `ruby-switch`
+    ```
+    sudo apt-add-repository ppa:brightbox/ruby-ng
+    sudo apt update
+    sudo apt install ruby2.0 ruby2.0-dev ruby-switch
+    ```
+- Set Ruby version
+    ```
+    sudo ruby-switch --set ruby2.0
+    ```
+- Install `bundler`
+    ```
+    sudo gem install bundler
+    ```
+- Install required gems through bundler
+    ```
+    bundle install
+    ```
+- In case of sticky folder error during `bundle install`, execute the following to fix permissions
+    ```
+    find ~/.bundle/cache -type d -exec chmod 0755 {} +
+    ```
+
+### Running
+
+- Run Jekyll through bundler
+    ```
+    bundle exec jekyll serve --future --incremental --config _config_dev.yml
+    ```
+    _Use `--force_polling` on Bash on Ubuntu on Windows due to a bug preventing watching._
+
+- Navigate to http://localhost:4000
+
+### Updating compiled JavaScript and CSS files
+
+- Install [Node.js](https://nodejs.org/download/)
+- Open Command Prompt and navigate to `src` directory
+    ```
+    cd <ACE3_directory>/docs/src
+    ```
+- Install Node packages
+    ```
+    npm install
+    ```
+    _On Bash on Ubuntu on Windows also install `nodejs-legacy` in case of errors._
+- Update files
+    ```
+    grunt
+    ```