A new intro paragraph to explain what Redash is (#4861)
A new intro paragraph to explain what Redash is (#4861)

* A new intro paragraph to explain what Redash is

We have been using Redash at Databricks and really love it. I took the time to work with Arik to create a better, more up-to-date description of the project.

* Add data sources
getredash/redash,alexanderlz/redash,getredash/redash,getredash/redash,denisov-vlad/redash,denisov-vlad/redash,denisov-vlad/redash,getredash/redash,getredash/redash,alexanderlz/redash,denisov-vlad/redash,alexanderlz/redash,alexanderlz/redash,denisov-vlad/redash