Resolves issues with secure cookies, blocking Shopify password form

[maxrolon]

This PR resolves a critical issue with BrowserSync's handling of SameSite=None/Secure cookies. Hopefully we'll get a fix directly into BrowserSync but in the meantime this should resolve the issue. The issue stopped allowing the Shopify password form from being able to be submitted since the returning storefront_digest={hash} SameSite=None/Secure cookie was getting invalidated and thus breaking Shopify's ability to establish a session in the response.

A PR has been logged with BrowserSync here: https://github.com/BrowserSync/browser-sync/pull/1964. The BrowserSync function of note is: https://github.com/BrowserSync/browser-sync/blob/master/packages/browser-sync/lib/server/proxy-utils.js#L122

In my diagnosis of the issue I also added support for self certified TLS certificates so that the browser won't prompt that localhost is not secure. In order to use this functionality the following tutorials can be followed:

• https://ryanparman.com/posts/2019/how-to-create-local-tls-certificates-for-development-on-macos/
• https://blogjunkie.net/2017/04/enable-https-localhost-browsersync/

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