docs: add a help page for reading the results page

[masiarek]

Description

Adds a help page, Reading Your Results (docs/help/reading_your_results.md), that walks a voter through a results page from top to bottom:

• The headline — what the PRELIMINARY label means (links to Preliminary Results) and what the voter count counts (ballots in the tally; a ballot scoring everyone the same is an abstention).
• The two round charts — the Scoring Round, the Automatic Runoff, Equal Support, and the majority-threshold line with its half-of-voters-with-a-preference denominator, which is the number readers most often misread.
• Race Details — the Scores Table and the Runoff Table's two percent columns (% Runoff Votes vs % Between Finalists) and which one decides the race.
• Stats for Nerds — one short section per panel (Tabulation Steps, Head-to-Head Matchups, Distribution of Equal Support, Average Supporter Profile), each naming the denominator that panel uses, since that is where most "that can't be right" moments come from.

Notes for reviewers:

• The scoring-round-vs-runoff divergence gets one paragraph here on purpose — docs: add a help page for why the highest score doesn't always win #1528 proposes a dedicated page for that topic, so this page doesn't duplicate it (and doesn't link it, since it isn't on main yet; happy to add a link if docs: add a help page for why the highest score doesn't always win #1528 merges first).
• The page is written to work without images, but screenshots of a real results page (the round charts, a Head-to-Head bar, a Supporter Profile) would improve it — I've left those to whatever house style you prefer.
• Verified with a local github-pages Jekyll build: the page renders, appears in the sidebar under BetterVoting Documentation, and all internal links resolve (.md form, targets all on main).

Screenshots / Videos (frontend only)

N/A — docs only.

Related Issues

Complements #1528 (dedicated page on why the highest score doesn't always win).

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• docs/help/reading_your_results.md

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