Update Header styles

[Lykhoyda]

Closes #260

• Updated navbar background
• logo update
• fix navbar elements to jump to the next line
• fix colors, hover
• renamed Header component

updates:

• Fixed the gray background color of the page
• Logo color
• Watch the account navigation link for ConnectOrWatch component

[Tbaut]

• The background of the main app is #FAFCFD afaics from the design. Only the menu (and some components are #fff or white also on this, it's quite rare in design to use pure white/black. Let me catch up on that with Cindy. In the mean time, we can use white/black cf https://graphicdesign.stackexchange.com/questions/25356/why-not-use-pure-black-000-and-pure-white-fff

• Some elements like a loader are invisible now, there's a loader there usually. I believe it is

  Multix/packages/ui/src/components/select/MultiProxySelection.tsx

  Line 152 in ec101c7

  color: ${({ theme }) => theme.palette.primary.main};

  
  

• Having a horizontal scrollbar and the dropdown for Networks cut is worse than having the menu on 2 lines IMHO. We should implement this only after Rework the network dropdown #264
  

• Let's try not to use black or white in the code directly, and rather use the theme.palette colors so that we can change them quickly.

[Lykhoyda]

• The background of the main app is #FAFCFD afaics from the design. Only the menu (and some components are #fff or white also on this, it's quite rare in design to use pure white/black. Let me catch up on that with Cindy. In the mean time, we can use white/black cf https://graphicdesign.stackexchange.com/questions/25356/why-not-use-pure-black-000-and-pure-white-fff

• Some elements like a loader are invisible now, there's a loader there usually. I believe it is

  Multix/packages/ui/src/components/select/MultiProxySelection.tsx

  Line 152 in ec101c7

  color: ${({ theme }) => theme.palette.primary.main};

  

• Having a horizontal scrollbar and the dropdown for Networks cut is worse than having the menu on 2 lines IMHO. We should implement this only after Rework the network dropdown #264
  

• Let's try not to use black or white in the code directly, and rather use the theme.palette colors so that we can change them quickly.

The background color is probably not updated everywhere, please provide the link next time if there is a original version of the design.
2) I agree that is not ideal, but as I said it shouldn't affect the users as screen size is not common. Let's have 2 lines if it's "better" 😃

[Tbaut]

The background color is probably not updated everywhere, please provide the link next time

The link is in the original issue, pointing to a figma node that has been deleted in the mean time... Feel free to ask then. However the figma with this view is still there, and the screenshot in the original issue is also quite clear. On top of this there's a mention of "updating the background to the right gray". Doing my best to have well scoped issues, but at some point I can't do much more.

[Tbaut]

Looking great thanks a lot!