docs: getting started

[pd93]

As mentioned in #2011 (review), the getting started docs could do with a bit of an overhaul. The usage page has slowly grown and become a bit daunting to a new user. It also doesn't mention --init in any capacity.

This PR solves both of these by adding a new Getting Started page to the website. This page is written more as a tutorial than a reference which is friendlier to new users. It instructs the user how to create a new Taskfile using --init, how to call it and how to write a basic build task.

[andreynering]

That's a great idea!

In theory we could consider adding this page to the top bar, but I don't want to pollute it with too many items.

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I propose that we at least add a mention on the home, near where we already link the usage page.

[pd93]

That's a great idea!

In theory we could consider adding this page to the top bar, but I don't want to pollute it with too many items.

Yeah, I think that most users will find it from the sidebar once they're in the docs section anyway.

I propose that we at least add a mention on the home, near where we already link the usage page.

I hadn't looked at the home page at all, but I agree. I would actually suggest replacing the example Taskfile we have there as this sort of duplicates some of the getting started. Something like this (pushed):

[andreynering]

Looks good!