nav: add Research to every page, align the home curl blockHEADmain

The nav is hand-copied into each page, so adding Research only to the pages
that were being edited left readers losing the link as soon as they entered an
article (6 of 9 pages lacked it). All nine now carry an identical line.

Home page: RESEARCH: had one space more than its neighbours and sat a column
out of the curl block.

Note: /research itself is still uncommitted (research/ is untracked), so
deploying this alone would publish nine links to a 404. Ship the research page
in the same push.

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