Auto-update country URL

[MrSpiffyClean]

Proposed solution for #163.

The submitted code does some things:

• Removes the Create Shareable Link button.
• Automatically updates the URL address whenever a country/location button is pressed, whenever the parameter/region/scale is changed and whenever the trending line is changed (disabled or value changed)
• Whenever the page displays default values, the address bar doesn't clog up with all the countries and omits them until someone presses more countries.
• Whenever someone selects all or none countries, the same logic above applies, and a new parameter, select, is used.

I've tested the code locally (using the simple Python server) and everything seems to work properly, although any sort of code review is very welcome (as I'm still a bit new to JS).

There is an odd case whenever someone selects all countries and then changes to Reported Deaths, instead of showing the simplified parameter, the URL bar does clog up a little. The end result is the same.(Fixed)

Feedback is welcome.

[netlify[bot]]

Deploy preview for frosty-benz-8c81bf ready!

Built without sensitive environment variables with commit 09f74c9c8b4d8df49ca933ed26fcfe0f56fadec0

https://deploy-preview-179--frosty-benz-8c81bf.netlify.app

[rpkoller]

out of curiosity is it necessary that the question mark on the initial page load (with the default values) is shown? that url looks a bit odd ;) https://deploy-preview-179--frosty-benz-8c81bf.netlify.app/? aside function wise it looks fine and works as expected (at least from my perspective but i am not js savvy ;))) )

[MrSpiffyClean]

You are right, it does look a bit odd. I might have seen it while testing but was never bothered by it. Anyway, I've managed to track down the fault and do a quick fix, it should work as expected now.

[rpkoller]

yep I can confirm, the ? is gone for the default view now :) cool

[aatishb]

Wow, @MrSpiffyClean this is a big one! Thanks for submitting this, I'll aim to review by Tuesday. @rpkoller thanks for testing & feedback!

[MrSpiffyClean]

I've just added a bit more stuff, aiming to fix the edge case I pointed out at the start of the pull request. By doing it, I ended up clearing another edge case.