Bug: Use link tag instead of javascript navigation in apps list

[mmv08]

This PR:

• Makes use of <a> tag in apps list because attaching a listener to div is not a good accessibility practice, also it's hard to distinguish between apps when you're developing locally
• Add declaration for styled components theme

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[github-actions]

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Type	Occurrences	Fixable
Errors	0	0
Warnings	0	0
Ignored	0	N/A

• Result: ✅ success
• Annotations: 0 total

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[ghost]

Travis automatic deployment:
https://pr1770--safereact.review.gnosisdev.com/rinkeby/app

[ghost]

Travis automatic deployment:
https://pr1770--safereact.review.gnosisdev.com/volta/app

[nicosampler]

one more question, why can't we use something linke so: ${({ theme }) => theme.colors.background}?

[mmv08]

forgot it 😄 a good catch
I also added a declaration for SC theme

[ghost]

Travis automatic deployment:
https://pr1770--safereact.review.gnosisdev.com/rinkeby/app

[ghost]

Travis automatic deployment:
https://pr1770--safereact.review.gnosisdev.com/volta/app