README: Let markdown do the enumeration

README.md

@@ -2,17 +2,17 @@
 
 We held a workshop at the [PyDays Vienna](https://www.pydays.at/) titled [Free Stuff for Devs](https://cfp.linuxwochen.at/de/LWW19/public/events/898) on May 3 2019. To get an idea of what was covered, it's best to first take a look at the [Overview](1 - Overview.ipynb). If we piqued your interest, go ahead and take a look at all the Jupyter Notebooks we shared!
 
-* [1 - Overview](1 - Overview.ipynb)
-* [2 - Metadata and Catalogue](2 - Metadata and Catalogue.ipynb)
-* [2.1 - SRU](2.1 - SRU.ipynb)
-* [2.2 - OAI-PMH](2.2 - OAI-PMH.ipynb)
-* [2.3 - SPARQL](2.3 - SPARQL.ipynb)
-* [3 - Images and Text](3 - Images and Text.ipynb)
-* [3.1 - IIIF Collection from SPARQL](3.1 - IIIF Collection from SPARQL.ipynb)
-* [3.2 - Images - Download pre-downsized images for machine learning](3.2 - Images - Download pre-downsized images for machine learning.ipynb)
-* [3.3 - Text - Download OCR Text](3.3 - Text - Download OCR Text.ipynb)
-* [4 - Webarchive](4 - Webarchive.ipynb)
-* [4.1 - Webarchive - Interacting with the API](4.1 - Webarchive - Interacting with the API.ipynb)
-* [4.2 - Webarchive - Full Text Search](4.2 - Webarchive - Full Text Search.ipynb)
-* [4.3 - Webarchive - Wayback Search](4.3 - Webarchive - Wayback Search.ipynb)
-* [4.4 - Webarchive - Download preview SVG thumb of saved page](4.4 - Webarchive - Download preview SVG thumb of saved page.ipynb)
+1. [Overview](1 - Overview.ipynb)
+1. [Metadata and Catalogue](2 - Metadata and Catalogue.ipynb)
+   1. [SRU](2.1 - SRU.ipynb)
+   1. [OAI-PMH](2.2 - OAI-PMH.ipynb)
+   1. [SPARQL](2.3 - SPARQL.ipynb)
+1. [Images and Text](3 - Images and Text.ipynb)
+   1. [IIIF Collection from SPARQL](3.1 - IIIF Collection from SPARQL.ipynb)
+   1. [Images - Download pre-downsized images for machine learning](3.2 - Images - Download pre-downsized images for machine learning.ipynb)
+   1. [Text - Download OCR Text](3.3 - Text - Download OCR Text.ipynb)
+1. [Webarchive](4 - Webarchive.ipynb)
+   1. [Webarchive - Interacting with the API](4.1 - Webarchive - Interacting with the API.ipynb)
+   1. [Webarchive - Full Text Search](4.2 - Webarchive - Full Text Search.ipynb)
+   1. [Webarchive - Wayback Search](4.3 - Webarchive - Wayback Search.ipynb)
+   1. [Webarchive - Download preview SVG thumb of saved page](4.4 - Webarchive - Download preview SVG thumb of saved page.ipynb)