Add Speakers component to read data from Sessionize

[ericsanner]

Description / Motivation

https://trello.com/c/llPZzrxf/38-create-speaker-component

Create a speaker component that can read from sessionize.

How Has This Been Tested?

• This component is a modified clone of the people grid.
• You can change the number of columns, alphabetize, set a background color
• The heading field can be edited via EE
• It has been tested on mobile and desktop
• It gives a console error if it cannot read from the sessionize url
• It only displays the heading if the sessionize url is false or cannot read the data.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have read the Contributing guide.
• My code/comments/docs fully adhere to the Code of Conduct.
• My change is a code change.
• My change is a documentation change and there are NO other updates required.