Correctly parse and implement netlify.toml

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Netlify doesn't clearly specify required properties for toml configs and testing what happens within different scenarios is a pain so for the purpose of simplifying things I think it's best to enforce explicit with toml configurations, for example an error will be thrown if the static router is being initialised but there is no build.publish property specified.

Context

• Derive context from current git branch.
• Add a -c --context option to override.
• Inject environment variables if any.
• Support base prop.

Redirects

• Support from, to prop.
• Support status prop.
• Support force prop (could be tricky).
• Support query prop (could be tricky).
• Support conditions prop (could be really tricky).
• Support headers prop.

Headers

• General support for setting headers based on for prop.

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Ps. I don't use headers or redirects props which aren't currently implemented, so this is already on the back burner...

[8eecf0d2]

Turns out Netlify redirects aren't actual redirects 🤦‍♀️ but rather routing rules for the static server so 0dcaeaa was actually semi correct... will try and implement a clean solution using serve-static, adding support for glob patterns will be a challenge.

Not sure how I missed it, just finished reading Netlify's Redirect Docs and it's not looking good for redirects support... this is going to be a major feature to implement, I'll try and break it down as logically as possible and provide a checklist in another issue. 🙈

[8eecf0d2]

Closing in favour of #8