Remove Fantom.

[jubeira]

Description

Fantom was added so as to give partial support to it in balpy, but only a few contracts were really untouched.
Since Fantom is under Beets' control and having it here collides with some automation around docs, it's better to just remove it.

The contracts are still deployed and usable of course; this is just to make documentation more consistent.

Type of change

• Bug fix
• New feature
• Breaking change
• Dependency changes
• Code refactor / cleanup
• Documentation or wording changes
• Other

Checklist:

• The diff is legible and has no extraneous changes
• N/A Complex code has been commented, including external interfaces
• N/A Tests are included for all code paths
• The base branch is either master, or there's a description of how to merge

Issue Resolution

N/A

[jubeira]

Let's remove goerli first.