docs: add content to introduction page

[ollema]

I figured it could maybe be nice with one PR per section of the docs, so they could me reviewed, revised and merged asynchronously.

let me know if you instead prefer one big PR :)

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[ollema]

for this listing of features, I took some from the landing page and others I came up with myself.

let me know if you would rather have them exactly as they are listed on the landing page!

[huntabyte]

Looks great! Feel free to update the ones on the landing page if you want!

[ollema]

as always, feel free to edit or close the PR if you have any issues with the grammar/wording and/or spelling. English is not my first language, I tried my best @huntabyte

[huntabyte]

Looks great! Feel free to update the ones on the landing page if you want!