Move the interactive-article + nasdisks links into a bold callout above the
chart (were blending into the image / stuck at the very end). Reword the Files
line to column names so GitHub stops parsing the two $ signs as LaTeX math.
Move the price-trends pointer into the intro (was buried under the file table),
and add a nasdisks.com link at the top of price-trends/README.md so a direct
visitor to that folder finds the site too.
Computed monthly medians (Jul 2024 onward) plus a chart. Aggregate only - no
underlying per-drive price observations. Method and interactive version noted
in price-trends/README.md.
