feat: add token / switch network styles

[gabitoesmiapodo]

Closes #182

Description:

• Removed the "Switch / add network + add token" demo.
• Configured TokenDropdown so it uses a very basic TokenSelect component, the extra features are not needed here.
• Configured TokenInput so it uses a complete version of TokenSelect, because this is a use case where all the features could be needed. This is where the "add token" feature can be found now.
• Removed the "switch network" feature from token select. It's not needed here and having a dropdown whose items do 2 different things is confusing.
• Added a new SwitchNetwork component and its demo. It should show the current network by default, but only if the current network is Ethereum, Arbitrum One, Optimism, or Polygon. If not, it'll ask the user to select a network from one of those options.
• Moved all the components from the Web3Buttons to sharedComponents root.

Steps:

Check that everything I said above is true.

Type of change:

• [x] New feature
• [ ] Bug fix
• [ ] Breaking change
• [ ] Enhancement
• [ ] Refactoring
• [ ] Chore

How Has This Been Tested?

• [ ] Manual testing
• [ ] Automated tests
• [ ] Other (explain)

Remember to check that:

• Your code follows the style guidelines of this project
• You have performed a self-review of your code
• You have commented your code in hard-to-understand areas
• You have made corresponding changes to the documentation
• Your changes generate no new warnings

Screenshots

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