Header Link Readjustment

I've updated the header again.

  • Slight reordering of the links under Members
  • Gave Sardonyx: RtW its own section, so newcomers to the site better know where to look.
    • It's still linked under Projects, because redundancy can't hurt in this case.
  • Moved the Codex to the RtW section, because otherwise it wasn't clear what it was and we don't need an entire dropdown for one wiki.