change time ago format

hide nonce field in the block views

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footer frontend link

Co-authored-by: tom goriunov <tom@ohhhh.me>

Add link to frontend migration guide in docs

* base implementation of entity

* refactor other components to make use of BlockEntity

* tests

* migrate entities w/o icon + L2 blocks

* base implementation of tx entity

* delet TransactionSnippet

* remove type="transaction" from AddressLink

* tests for TxEntity

* make EntityBase components

* common styles for icon color and spacing to text

* update icon color in tests

* update icons to slime format

* Address entity

* move Inventory tab to the first place for NFT tokens pages

* update testnet tx alert text

* fix footer layout

* small fixes in blocks fields + config for rootstock

* add env for hidding fields in block views

* [skip ci] update docs