Add MariaDB devroom

content/schedule/devrooms/mariadb.html

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+<p>The MariaDB devroom is a room for all things MariaDB, the open source relational database.</p>
+<p>MariaDB Server is one of the most popular open source relational databases. It’s made by the original developers of MySQL and guaranteed to stay open source. It is part of most cloud offerings and the default in most Linux distributions.</p>
+<p><a href="https://mariadb.org">The MariaDB Foundation</a> is a non-profit supporting continuity and open collaboration in the MariaDB ecosystem.</p>