fix line length readme, index, guide(#250)

README.md

@@ -1,8 +1,10 @@
 # ESMValTool Tutorial
 
 [![Join the chat at
-https://gitter.im/ESMValGroup/Tutorial](https://badges.gitter.im/ESMValGroup/Tutorial.svg)](https://gitter.im/ESMValGroup/Tutorial?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
-[![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.3974592.svg)](https://doi.org/10.5281/zenodo.3974592)
+https://gitter.im/ESMValGroup/Tutorial](https://badges.gitter.im/
+ESMValGroup/Tutorial.svg)](https://gitter.im/ESMValGroup/Tutorial?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
+[![DOI](https://zenodo.org/badge/DOI/10.5281/zenodo.3974592.svg)](https://doi.
+org/10.5281/zenodo.3974592)
 
 
 [ESMValTool Tutorial][tutorial-site] is an open-source project in

_extras/guide.md

@@ -13,15 +13,16 @@ your cohort may need extra time, any changes you want to make or
 additional examples you would like to include. 
 
 If you want to add to or adapt the material, you can create your own copy to 
-modify by forking the repository. See here for a guide  on [how to fork a repository](https://docs.github.com/en/enterprise/2.13/user/articles/fork-a-repo).
+modify by forking the repository. See here for a guide  on 
+[how to fork a repository](https://docs.github.com/en/enterprise/2.13/user/articles/fork-a-repo).
 
 Please use our guide for [Contributing](CONTRIBUTING.md) when creating your 
 own material just in case you would like to add to the current 
 repository in the future.
 
 Once you are satisified with the material you would like to use and have 
 an estimate of the time required, please proceed with meeting logistics.
- 
+
 ## Meeting Logistics
 
 Decide if the tutorial will be held on site or online. If on site, make 

index.md

@@ -12,7 +12,10 @@ causes and effects of model biases and inter-model spread within the CMIP model
 ensemble.
 
 This tutorial is structured into ``basic`` and ``advanced`` topics such that episodes 
-starting from the [Introduction]({{ page.root }}{% link _episodes/01-introduction.md %}) up to the episode on [Conclusion of the basic tutorial]({{ page.root }}{% link _episodes/05-conclusions.md %})
+starting from the 
+[Introduction]({{ page.root }}{% link _episodes/01-introduction.md %}) up to 
+the episode on 
+[Conclusion of the basic tutorial]({{ page.root }}{% link _episodes/05-conclusions.md %})
 all cover basic topics and can be done in one sitting. 
 
 The remaining episodes cover the advanced topics and each episode is a