Fix 23194 - Add ucora to orgs using d

[dkorpel]

Reboot of #3326 @maxhaton

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Bugzilla references

Auto-close	Bugzilla	Severity	Description
✓	23194	trivial	Add our company to the list of D firms

[maxhaton]

I still can't build the site so if you can get the CSS working and all that go for it

[dkorpel]

It looks good on my end, you can preview it with DAutoTest:

http://dtest.dlang.io/artifact/website-21c599a311e1113108be0f477cb89ffeebce951e-a9fdafe0b16f6e2b980fd1991a5cf5c3/web/orgs-using-d.html