fix(a11y): wrap course grids in nav landmarks

OxfordRSE / gutenberg

https://oxfordrse.github.io/gutenberg

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fix(a11y): wrap course grids in nav landmarks #241

Closed eatyourgreens closed 4 months ago

eatyourgreens commented 4 months ago

Wrap each column of a course grid in <nav>, rather than <div>. Label the navigation with the grid heading tag, if one is defined. Markup the list of links as an unordered list.