docs: readme and images matching actual Arsenik (#26)

* docs: readme and images matching actual Arsenik

* docs: Kazé PR review

Co-authored-by: Fabien Cazenave <[email protected]>

* docs: meaningful links

* docs: Discord PR review

* docs: all images in ortho layout except on home

* docs: one page explanation

* docs: Kazé PR review

Co-authored-by: Fabien Cazenave <[email protected]>

* docs: Kazé PR review

* docs: Lafayette layer instead of 1dk layer

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Co-authored-by: Fabien Cazenave <[email protected]>