Fix displayed name in the menu, the dropdown menu's positioning and include more articles

[MikelAlejoBR]

These changes:

• Fix the displayed user's name in the dropdown menu. Now it shows the user's first name and given name, for consistency with the rest of the Red Hat websites.
• The dropdown menu was being open to the right of the dropdown header itself, causing it to be cropped to the right.
• Includes more articles for the "Activities" page.

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