📚 Update README.md and Usage docs

* Remove the "in current directory" in the usage instructions.
* Add a neat Copier badge.

Author: mbercx

README.md

@@ -1,3 +1,5 @@
+[![Copier](https://img.shields.io/endpoint?url=https://raw.githubusercontent.com/copier-org/copier/master/img/badge/badge-black.json)](https://github.com/copier-org/copier)
+
 # `aiida-plugin-copier`
 
 Template for AiiDA plugin packages based on [`copier`](https://copier.readthedocs.io/en/latest/).
@@ -11,4 +13,4 @@ Then simply run
 copier copy https://github.com/mbercx/aiida-plugin-copier <plugin_name>
 ```
 
-And answer the questions to generate a new AiiDA plugin package in the current directory.
+And answer the questions to generate a new AiiDA plugin package.

docs/index.md

@@ -1,4 +1,4 @@
-# Introduction
+# Getting Started
 
 A `copier`-based template for AiiDA plugin packages.
 
@@ -11,4 +11,4 @@ Then simply run
 copier copy https://github.com/mbercx/aiida-plugin-copier <plugin_name>
 ```
 
-And answer the questions to generate a new AiiDA plugin package in the current directory.
+And answer the questions to generate a new AiiDA plugin package.