Create a util to more concisely parse query params

[kale-stew]

[regarding v6]

Currently, there are two issues with the way we are parsing query params:

1. Users need to pass =true to query params for them to take hold, i.e. localhost:3000/?presenterMode=true
2. Location matters, so a user cannot append their URL with presenterMode=true, it has to come immediately after the localhost, before any other slideElements are tacked on

We should handle this differently. In addition to parsing these in a cleaner way, we should add support for (listed in priority order):

• ?presenter
• ?overview
• ?export
• ?print
• ?export&print

[ruhci28]

Hii, @kale-stew can I work on this .?

[kale-stew]

@ruhci28 absolutely!