refactor(guide): Refactor installation guide (#427)

* Update Spell_system.md

* refactor(guide): Refactor installation guide

* Update Requirements.md

* Update Requirements.md

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* note to self: next windows

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* Rename Requirements.md to requirements.md

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Ubuntu installation with seperate MariaDB and Oracle MySQL

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Co-authored-by: Nolt <nolt@users.noreply.github.com>
Co-authored-by: Francesco Borzì <borzifrancesco@gmail.com>

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+# Linux Core Installation
+
+| Installation Guide | |
+| :- | :- |
+| This article is a part of the Installation Guide. You can read it alone or click on the previous link to easily move between the steps. |
+| [<< Step 1: Requirements](requirements.md) | [Step 3: Server Setup >>](server-setup.md) |
+
+## Required software
+
+See [Requirements](requirements.md) before you continue.
+
+## Getting the source code
+
+Choose **ONE** of the following method, run one of the below `git ...` commands in your terminal.
+
+
+1. Clone only the master branch + full history (smaller size - recommended):
+
+    ```sh
+    git clone https://github.com/azerothcore/azerothcore-wotlk.git --branch master --single-branch azerothcore
+    ```
+
+1. Clone only the master branch + no previous history (smallest size):
+
+    ```sh
+    git clone https://github.com/azerothcore/azerothcore-wotlk.git --branch master --single-branch azerothcore --depth 1
+    ```
+
+    Note: If you want to get the full history back, use `git fetch --unshallow`.
+
+1. Clone all branches and all history:
+
+    ```sh
+    git clone https://github.com/azerothcore/azerothcore-wotlk.git azerothcore
+    ```
+
+This will create an `azerothcore-wotlk` directory containing the AC source files.
+
+## Compiling the source code
+
+### Creating the build-directory
+
+To avoid issues with updates and colliding source builds, we create a specific build-directory, so we avoid any possible issues due to that (if any might occur)
+
+```sh
+cd azerothcore
+mkdir build
+cd build
+```
+
+### Configuring for compiling
+
+Before running the CMake command, replace `$HOME/azeroth-server/` with the path of the server installation (where you want to place the compiled binaries).
+
+Parameter explanation for advanced users [CMake options](CMake-options.md).
+
+At this point, you must be in your "build/" directory.
+
+**Note**: in the following command the variable `$HOME` is the path of the **current user**, so if you are logged as root, $HOME will be "/root". You can check the state of the environment variable, as follows:
+
+```sh
+echo $HOME
+```
+
+**Note**: in case you use a non-default package for `clang`, you need to replace it accordingly. For example, if you installed `clang-6.0` then you have to replace `clang` with `clang-6.0` and `clang++` with `clang++-6.0`
+
+```sh
+cmake ../ -DCMAKE_INSTALL_PREFIX=$HOME/azeroth-server/ -DCMAKE_C_COMPILER=/usr/bin/clang -DCMAKE_CXX_COMPILER=/usr/bin/clang++ -DWITH_WARNINGS=1 -DTOOLS=0 -DSCRIPTS=1
+```
+
+To know the amount of cores available.
+You can use the following command
+
+```sh
+nproc --all
+```
+
+Then, replacing `6` with the number of threads that you want to execute, type:
+
+```sh
+make -j 6
+make install
+```
+
+<br>
+
+## Help
+
+If you are still having problems, check:
+
+* [How to ask for help](How-to-ask-for-help.md)
+
+* [Join our Discord Server](https://discord.gg/gkt4y2x), but it is not a 24/7 support channel. A staff member will answer you whenever they have time.
+
+| Installation Guide | |
+| :- | :- |
+| This article is a part of the Installation Guide. You can read it alone or click on the previous link to easily move between the steps. |
+| [<< Step 1: Requirements](requirements.md) | [Step 3: Server Setup >>](server-setup.md) |