Update emojis in Merkle DAG images to be distinct (#632)

* feat: update merkle dag images

* feat: adjust text to reflect new images

* add max width to simpler images

* fix: use paths instead of text in SVGs

* chore: compress assets

Co-authored-by: terichadbourne <terichad@gmail.com>
Co-authored-by: Zé Bateira <jose.bateira@protonmail.com>

Author: 3 people