Add url parameter support

[kimberlyh66]

Allow users to search for a specific map, plot, and management timeline by supplying url parameters (experiment name, sub experiment name, trait name, cultivar, and date).

[dlebauer]

please separate into different files

[kimberlyh66]

Output render functions have been removed from app.R and placed into separate files (either render-home-outputs.R or render-search-outputs.R depending on if render function is for home or search page) to improve organization of code.

[Chris-Schnaufer]

Waiting on review of Pull Request

[dlebauer]

Probably needs to be refactored; could take the opportunity to implement a shiny package using the golem framework https://github.com/ThinkR-open/golem

[Chris-Schnaufer]

Needs discussion and investigation:
Investigate Golem for packaging the changes made; new functionality were added. It's not clear that the current approach is best.
Perhaps Kristina and Emily collaborate on reviewing this. Create a ticket to look into creating issues for bugs?
David: Kristina spend a day trying this out and documenting found problems