Link to JuliaCon 2021 talk and simplify readme

Author: c42f

README.md

@@ -3,23 +3,19 @@
 [![Version](https://juliahub.com/docs/DataSets/version.svg)](https://juliahub.com/ui/Packages/DataSets/4adr3)
 [![docs latest](https://img.shields.io/badge/docs-latest-blue.svg)](https://juliahub.com/docs/DataSets)
 
-DataSets.jl exists to help manage data and reduce the amount of data wrangling
-code you need to write. It's annoying to write
-* Command line wrappers which deal with paths to data storage
-* Code to load and save from various *data storage systems* (eg, local
-  filesystem data; local git data, downloaders for remote data over various
-  protocols, etc)
-* Code to load the same data model from various serializations (eg, text:
-  plain/compressed, property tree: toml/json/msgpack/bson/...
-  tabular: csv/csv.gz/parquet/sqlite/...)
-* Code to deal with data lifecycle; versions, provenance, etc
+DataSets helps make data wrangling code more reusable.
 
-DataSets provides scaffolding to make this kind of code more reusable.  We want
-to make it easy to *relocate* an algorithm between different data environments
-without code changes. For example from your laptop to the cloud, to another
-user's machine, or to an HPC system.
+* We want to make it easy to *relocate* an algorithm between different **data
+  storage environments** without code changes. For example from your laptop to
+  the cloud, to another user's machine, or to an HPC system.
+* We want to reduce coupling between data and code, by storing **rich type
+  information** in metadata. Metadata bridges the gap between the ad hoc
+  implicit type system of data outside your program and the Julia data
+  structures within your program.
 
-Read [**the latest documentation**](https://juliahub.com/docs/DataSets) more information.
+Watch [**DataSets.jl talk**](https://www.youtube.com/watch?v=PJkf0CO5APs) from
+JuliaCon 2021, or read [**the latest documentation**](https://juliahub.com/docs/DataSets)
+more information.
 
 ### Development