remove manual TOC and insert toc-me marker

This will allow the TOC to be kept up to date automatically by the bot.

https://github.com/pholleran/toc-me

README.md

@@ -47,32 +47,7 @@ commit [0360811][].  It was created via `git clone --bare` and `git push
 
 ## Table of contents
 
-- [Installation](#installation)
-  - [Supported Bash versions](#supported-bash-versions)
-  - [Homebrew](#homebrew)
-  - [npm](#npm)
-  - [Installing Bats from source](#installing-bats-from-source)
-  - [Running Bats in Docker](#running-bats-in-docker)
-    - [Building a Docker image](#building-a-docker-image)
-- [Usage](#usage)
-- [Writing tests](#writing-tests)
-  - [`run`: Test other commands](#run-test-other-commands)
-  - [`load`: Share common code](#load-share-common-code)
-  - [`skip`: Easily skip tests](#skip-easily-skip-tests)
-  - [`setup` and `teardown`: Pre- and post-test hooks](#setup-and-teardown-pre--and-post-test-hooks)
-  - [Code outside of test cases](#code-outside-of-test-cases)
-  - [File descriptor 3 (read this if Bats hangs)](#file-descriptor-3-read-this-if-bats-hangs)
-  - [Printing to the terminal](#printing-to-the-terminal)
-  - [Special variables](#special-variables)
-- [Testing](#testing)
-- [Support](#support)
-- [Contributing](#contributing)
-- [Contact](#contact)
-- [Version history](#version-history)
-- [Background](#background)
-  - [Why was this fork created?](#why-was-this-fork-created)
-  - [What's the plan and why?](#whats-the-plan-and-why)
-- [Copyright](#copyright)
+<!-- toc -->
 
 ## Installation