Add footer link for DeFiChainWiki

[0ptim]

What this PR does / why we need it:

This PR adds a link to the new defichainwiki.com site in the footer. This site provides a wealth of helpful articles about DeFiChain and will aid users in gaining a better understanding of the ecosystem.

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[0ptim]

@thedoublejay

[0ptim]

@thedoublejay @kyleleow @pierregee @G9000

It's now a full month since I opened this PR and still got no response. I'm happy to have a conversation if something is unclear.

[kynkong91]

Hi,

Appreciate the well put together wiki that you have come up with. For this PR, instead of adding the wiki to the footer, we are considering creating a new section titled Community Projects, and then add the wiki you created under there instead. There are 2 reasons for this:

• This will make the wiki more prominent and accessible instead of being hidden in the footer which no one really sees
• The current footer section is meant more as a sitemap for the website rather than external resources, and so from a UX perspective it might be strange to put them together

Let me know your thoughts on this.

[0ptim]

Your suggestion is much appreciated.

It's important to me that the wiki is easily accessible, as I've put a lot of time and effort into the project and plan to continue maintaining and expanding it. I hope you can understand my perspective.

If you have any other suggestions for making the wiki more accessible, please don't hesitate to let me know.