homepage icons updated (#17)

* Update snapshot.md

* Update index.tsx

* Update docusaurus.config.js

* Update docusaurus.config.js

* upd docusaurus.config.js

* Update _category_.json

* Delete docs/zetachain/endpoints directory

* Rename endpoints.mdx

* Update endpoints.mdx

* Update _category_.json

* Delete docs/zetachain/faq.md

* Update intro.md

* Update intro.md

* Update intro.md

* Update intro.md

* Update intro.md

* add pictures for white theme

* Delete static/img/undraw1.png

* Delete static/img/undraw1.svg

* Delete static/img/undraw2.png

* Delete static/img/undraw2.svg

* Delete static/img/undraw3.png

* Delete static/img/undraw3.svg

* icons added

---------

Co-authored-by: Influenzo <52459025+vasylcode@users.noreply.github.com>