Implement hww/embedded summary pages

[Hugoo]

At the moment, these 2 pages have the same text:

• https://wallet.page/hww/summary
• https://wallet.page/wallet/summary

We should use this opportunity to write a custom paragraph explained what are hardware wallets and a specific title.

To do:

• Header: "Hardware wallets summary"
• Paragraph: text that explains what are hardware wallets
• Remove the "We welcome contributions via the GitHub Repository."
• Change the robot illustration by an illustration of hardware wallets

Also, for the software wallets: "Who watches the wallets?", like, what does it even mean? Do we need this? I suggest to edit to "Ethereum wallets summary"

[lucemans]

The summary pages are currently unimplemented and copies of the homepage.

Maybe worth renaming this issue to "implement hww/embedded summary pages"