Update index.md

I deleted the "Before you start" callout as suggested in #154

Author: mimkes

index.md

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 This Library Carpentry lesson introduces librarians to relational database management system using SQLite. At the conclusion of the lesson you will: understand what SQLite does; use SQLite to summarise and link data.
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-## Before You Start:
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-You will need to install **DB Browser for SQLite** and download the **doaj-article-sample** database. See [Setup](https://librarycarpentry.org/lc-sql/setup.html) for instructions and further information.
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