fix: Extension - remove old dompurify, switch to new one

[jurevans]

This resolves the following errors in the Extension:

Uncaught TypeError: (0 , dompurify__WEBPACK_IMPORTED_MODULE_1__.sanitize) is not a function

The above error occurred in the <ApproveConnection> component:

This seems to have been caused when isomorphic-dompurify was introduced, so I switch this (and Faucet) over to the newer version and removed dompurify & @types/dompurify