HTML UI issues from #92 (mini.css) about pygeoapi

[justb4]

Problems 1) and 2): some html links have trailing slash '/' in page URLs. In those cases relative links within the page get expanded to URLs with 'items/items..' i.s.o. 'items/..'. . Will solve.

[justb4]

Item 3) : depends on content negotiation, default would be JSON (e.g. curl http://localhost:5000/). But in browser would be HTML, so need explicit f=json when HTML is rendered.

[justb4]

Can close IMO, pls re-open if still nav errors as listed above found.

[justb4]

Still stale links in map markers, caused by
https://github.com/geopython/pygeoapi/blob/master/pygeoapi/templates/items.html#L85 . One-liner fix needed similar to regular HTML ft id links in table view. Will fix.

To reproduce:

• open Point dataset with multiple pages in browser
• open HTML view on first page
• click link to Next Page
• click Marker in Map, popup opens with link to single Feature
• click link text in Marker
• 404 error as URL shows something like http://localhost:5000/collections/<dataset>/items/items/feature.11?f=html

Fix is similar to fix in table View in items.html.

[justb4]

Closing, pls re-open if still nav errors as listed above found.