Merge branch 'feature/web-ui-guide' into 'feature-6/docusaurus-setup'

.gitignore

.gitlab-ci.yml

docs/guides/web-api/categories-api.md

docs/guides/web-api/hello-api.md

docs/guides/web-api/intro.md

docs/guides/web-api/introduction.md

docs/guides/web-api/json-ld-source-api.md

docs/guides/web-api/search-api.md

docs/guides/web-ui/intro.md

docs/guides/web-ui/introduction.md

docs/guides/web-ui/primary-features.md

docs/guides/web-ui/secondary-features.md

docs/index.md

sidebars.ts

static/img/unhide-filter-tags.png

static/img/unhide-filters-filtered.png

static/img/unhide-landing-categories.png

static/img/unhide-landing-search.png

static/img/unhide-results-categories.png

static/img/unhide-results-filters.png