Updated PAR URLs and fixed markdown validation issues

[richardcevans]

Add here your WMS ID: 3300

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[richardcevans]

it appears that the image filename validation rule (Rule 14) has a regex bug — it captures the optional title text (e.g., "Open terminal") along with the filename. I believe my image filenames are all lowercase and correct; the false positives are triggered by uppercase characters in the title strings.