Use mdbook include over custom script

README.md

@@ -7,7 +7,7 @@
 [![Downloads](https://img.shields.io/crates/d/rew)](https://crates.io/crates/rew)
 [![License](https://img.shields.io/crates/l/rew.svg)](https://github.com/jpikl/rew/blob/master/LICENSE.md)
 
-<!--[DOCS_CONTENT_START]-->
+<!-- ANCHOR: description -->
 
 **rew** is a collection of small command-line tools for text processing, bundled in a single binary.
 
@@ -17,13 +17,13 @@ These tools try to follow the Unix philosophy:
 - They process text streams.
 - They are easily composable.
 
-<!--[DOCS_CONTENT_END]-->
+<!-- ANCHOR_END: description -->
 
 ## Documentation
 
 Visit [rew website](https://jpikl.github.io/rew) for installation instructions, usage and more.
 
-<!--[DOCS_CONTENT_START]-->
+<!-- ANCHOR: showcase -->
 
 ## Showcase
 
@@ -101,7 +101,7 @@ Or into a tool like [GNU parallel](https://www.gnu.org/software/parallel/paralle
 > find src -type f | rew x 'mv {} dst/{base}.{ext | lower | replace eg g}' | parallel
 ```
 
-You are not limited only to `rew` subcommands. Call whatever tool you like. 
+You are not limited only to `rew` subcommands. Call whatever tool you like.
 For example, let's use `sed` instead of `rew replace` command:
 
 ```sh
@@ -110,7 +110,7 @@ For example, let's use `sed` instead of `rew replace` command:
 
 Have fun using rew!
 
-<!--[DOCS_CONTENT_END]-->
+<!-- ANCHOR_END: showcase -->
 
 ## License
 

book.toml

@@ -8,5 +8,3 @@ src = "docs"
 [output.html]
 git-repository-url = "https://github.com/jpikl/rew"
 git-repository-icon = "fa-github"
-
-[preprocessor.cmdrun]

docs/README.md

@@ -1,6 +1,7 @@
 # Introduction
 
-<!-- cmdrun ./import.sh ../README.md -->
+{{#include ../README.md:description}}
+{{#include ../README.md:showcase}}
 
 ## License