High-priority customizations for Gnosis Beacon Chain Explorer

[ulyanas]

1. Change page title "Stake Beacon Chain (Phase 0) ..." на "Gnosis Beacon Chain Explorer"

2. Currency dropdown - remove

3. Top left corner > GNO price - replace with "1 GNO = 32 mGNO" and link to https://docs.gnosischain.com/ , add token logo

4. Top left corner > Remove Login and SignUp

5. Bottom links > Resources - link Overview to https://docs.gnosischain.com/

6. Bottom links > Github > link to https://github.com/gnosischain/gbc-explorer

7. Remove copyright

8. Everywhere > replace "GBC Beacon Chain" with "Gnosis Beacon Chain (GBC)"

9. https://beacon.gnosischain.com/charts - check the graphics are in mGNO

10. https://beacon.gnosischain.com/charts - replace title "Charts from the Ethereum 2.0 Network" to "Charts from the Ethereum 2.0 Network" to "Charts from Gnosis Beacon Chain (GBC)"

11. https://beacon.gnosischain.com/vis - replace title "Eth2 Blockchain Visualization" to "GBC Blockchain Visualization", remove "By beaconcha.in"