Replace automated script with manual install steps to fix data loss

@TolichP [1] reported in #3 [2
`install.sh` script replaced the `config` file which led to
configuration/data loss. This was caused by the `-f` flag passed to the
`cp` command [3] which forced to override existing files.

This is a really critical bug and the the solution to provide a script
that automatically handles the simple task of copying a file has never
been a good idea at all. Therefore the script was removed and the
documentation has been adjusted to provide manual installation steps
instead like in other port projects, e.g. Nord Alacritty [4].
The manual steps are quite simple and the knowledge can be expected of
users since these are basic operations when running a Unix system.

Projects like Terminato, that require to modify the main user
configuration file instead of providing a way to load features like
themes from dedicated file, are always way harder to support as a
theme author. Anyway, there are plans to unify the installation of Nord
port projects through one universal automation tool,
but there is currently no ETA.

[1]: https://github.com/TolichP
[2]: #3 (comment)
[3]: https://github.com/arcticicestudio/nord-terminator/blob/af29e150a531f7984d362f4aa135c1bfffd13c45/install.sh#L83
[4]: https://github.com/arcticicestudio/nord-alacritty

GH-12

README.md

@@ -11,38 +11,47 @@ Based on the <a href="https://github.com/arcticicestudio/nord">Nord</a> color pa
 
 <p align="center"><img src="https://raw.githubusercontent.com/arcticicestudio/nord-terminator/develop/src/assets/scrot-colortest.png"/><blockquote>Font: <a href="https://adobe-fonts.github.io/source-code-pro">Source Code Pro</a> 12px.</blockquote></p>
 
-## Getting started
-### Installation
-#### Manual
-Copy the [`config`](https://github.com/arcticicestudio/nord-terminator/blob/develop/src/config) file to the local configuration directory `~/.config/terminator`.
-
-#### Install Script
-The included `install.sh` shell script can be used for an automated installation.  
-If no option is specified, the default color config file is `src/config`.
-
-A list of available options can be shown with the `--help` option.
-```shell
-./install.sh --help
-```
-Syntax: `install.sh [OPTIONS]`
-
-| Option | Description |
-| --- | --- |
-| `-h`, `--help` | Shows the help |
-| `-v`, `--verbose` | Verbose output |
-| `-c  <COLOR_CONFIG_FILE>`, `--configfile <COLOR_CONFIG_FILE>` | Use the specified color config file |
+## Installation
+
+To install _Nord_, the content of the [`config`][src-config] file must be manually transferred to [your configuration file][archw-terminator#config] that is usually located at `~/.config/terminator/config`.
+
+1. Replace or add the configuration keys for the `global_config` section:
+   ```diff
+   [global_config]
+   +  title_inactive_bg_color = "#4C566A"
+   +  title_inactive_fg_color = "#D8DEE9"
+   +  title_receive_bg_color = "#8FBCBB"
+   +  title_receive_fg_color = "#2E3440"
+   +  title_transmit_bg_color = "#88C0D0"
+   +  title_transmit_fg_color = "#2E3440"
+   ```
+2. Append the `[[nord]]` profile of to the `[profiles]` section to create a new profile for _Nord_:
+   ```diff
+   [profiles]
+   +  [[nord]]
+   +    background_color = "#2E3440"
+   +    cursor_color = "#D8DEE9"
+   +    foreground_color = "#D8DEE9"
+   +    palette =    "#3B4252:#BF616A:#A3BE8C:#EBCB8B:#81A1C1:#B48EAD:#88C0D0:#E5E9F0:#4C566A:#BF616A:#A3BE8C:#EBCB8B:#81A1C1:#B48EAD:#8F  BCBB:#ECEFF4"
+   ```
 
 ## Screenshots
+
 <p align="center"><strong>htop</strong><br><img src="https://raw.githubusercontent.com/arcticicestudio/nord-terminator/develop/src/assets/scrot-htop.png"/></p>
 
 ## Development
+
 [![](https://img.shields.io/badge/Changelog-0.1.0-81A1C1.svg?style=flat-square)](https://github.com/arcticicestudio/nord-terminator/blob/v0.1.0/CHANGELOG.md) [![](https://img.shields.io/badge/Workflow-gitflow--branching--model-81A1C1.svg?style=flat-square)](http://nvie.com/posts/a-successful-git-branching-model) [![](https://img.shields.io/badge/Versioning-ArcVer_0.8.0-81A1C1.svg?style=flat-square)](https://github.com/arcticicestudio/arcver)
 
 ### Contribution
+
 Please report issues/bugs, feature requests and suggestions for improvements to the [issue tracker](https://github.com/arcticicestudio/nord-terminator/issues).
 
 <p align="center"><img src="https://cdn.rawgit.com/arcticicestudio/nord/develop/src/assets/banner-footer-mountains.svg" /></p>
 
 <p align="center">Copyright &copy; 2016-present Arctic Ice Studio</p>
 
 <p align="center"><a href="https://github.com/arcticicestudio/nord-terminator/blob/develop/LICENSE.md"><img src="https://img.shields.io/badge/License-MIT-5E81AC.svg?style=flat-square"/></a> <a href="https://creativecommons.org/licenses/by-sa/4.0"><img src="https://img.shields.io/badge/License-CC_BY--SA_4.0-5E81AC.svg?style=flat-square"/></a></p>
+
+[archw-terminator#config]: https://wiki.archlinux.org/index.php/Terminator#Configuration
+[src-config]: https://github.com/arcticicestudio/nord-terminator/blob/develop/src/config