Fix markdown lint errors

Author: ewels

nf_core/pipeline-template/{{cookiecutter.name_noslash}}/docs/installation.md

@@ -2,18 +2,18 @@
 
 To start using the {{ cookiecutter.name }} pipeline, follow the steps below:
 
-<!-- Install Atom plugin markdown-toc-auto for this ToC to auto-update on save -->
-<!-- TOC START min:2 max:3 link:true asterisk:true update:true -->
+<!-- Install Atom plugin markdown-toc-auto for this ToC -->
+<!-- TOC START min:2 max:3 link:true asterisk:true -->
 * [Install NextFlow](#install-nextflow)
 * [Install the pipeline](#install-the-pipeline)
-    * [Automatic](#automatic)
-    * [Offline](#offline)
-    * [Development](#development)
+  * [Automatic](#automatic)
+  * [Offline](#offline)
+  * [Development](#development)
 * [Pipeline configuration](#pipeline-configuration)
-    * [Docker](#docker)
-    * [Singularity](#singularity)
-    * [Conda](#conda)
-    * [Configuration profiles](#configuration-profiles)
+  * [Docker](#docker)
+  * [Singularity](#singularity)
+  * [Conda](#conda)
+  * [Configuration profiles](#configuration-profiles)
 * [Reference genomes](#reference-genomes)
 <!-- TOC END -->