[skip ci] update GHA to allow for skip ci

hide preview pane if dataset does not have preview

chores

chore: update dataset previewer dep

fix typo in advanced/url doc

remove ngx-bootstrap dependency

Dev upgrade to angular 9

introduce tests

added tests to prevent regression

Dev spatial data menu to explore dataset

chore: implemented test to avoid regression

bugfix: mouseOver directive not capturing scanning region properly
feat: reworked region menu component
feat: introduced landmark component
chore: reworked spatial search endpoint