[jampukka]

new template fragment, key piece:

• mapLibs.ftl
  • Holds the Leaflet and proj4/proj4leaflet imports, included by featureCollection.ftl and feature.ftl after backgroundMap.ftl (proj4 is only loaded when bgProj4 is set)
  • Keeps the two map pages on the same library versions, which they were not before (feature.ftl was still on Leaflet 1.7.1 / proj4 2.7.5)

Library versions:

• Bootstrap 5.0.0-beta3 -> 5.3.8 (all seven templates using it)
• Leaflet 1.7.1 -> 1.9.4, proj4 2.7.5 -> 2.22.0 (proj4leaflet stays at 1.0.2, the latest)
• swagger-ui 3.45.1 -> 5.29.1 (still cdnjs)
• All SRI hashes were recomputed from the downloaded files, and every URL points to a file the package actually publishes (no jsDelivr on-the-fly minification, see Fix SRI hash failures by using published proj4 and proj4leaflet files #216)

The effects of Bootstrap version bump, validated that the new ones look good (again, default HTML templates are not the focus point of hakunapi):

• The JSON link in the page header no longer uses navbar-brand: in Bootstrap 5.3 its spacing and font size come from CSS variables that only exist inside a .navbar, and here it sits in a .nav. It now uses utility classes and looks as before.
• A custom template directory that overrides feature.ftl or featureCollection.ftl keeps its own library versions until it includes mapLibs.ftl.
• Bootstrap 5.3 shifts a few shades slightly (table text is pure black, text-muted footer, active breadcrumb and pagination hover are a bit different). Nothing breaks and the layout is unchanged. Not verified in a browser beyond a manual check of the pages.

Should fix #199