Load datasets + Datasets grid + Datasets search (#889)

* [examples/openspending][m] - added loader + fetching from datapackage

- Also added an indexing example

* [examples/openspending,home][xl]: removes datasets table, implement dataset cards grid, implement country facet

* [examples/openspending,home][m]: add min date and max date facets

---------

Co-authored-by: Luccas Mateus de Medeiros Gomes <luccasmmg@gmail.com>

examples/openspending/lib/loader.ts

@@ -0,0 +1,34 @@
+import { FiscalDataPackage } from './datapackage.interface';
+import { Project } from './project.interface';
+
+export function loadDataPackage(datapackage: FiscalDataPackage, repo): Project {
+  return {
+    name: datapackage.name,
+    title: datapackage.title,
+    owner: {
+      name: repo.owner.login,
+      logo: repo.owner.avatar_url,
+      // TODO: make this title work
+      title: repo.owner.login,
+    },
+    repo: { name: repo, full_name: repo.full_name },
+    files: datapackage.resources,
+    author: datapackage.author ? datapackage.author : null,
+    cityCode: datapackage.cityCode ? datapackage.cityCode : null,
+    countryCode: datapackage.countryCode
+      ? (datapackage.countryCode as string)
+      : null,
+    fiscalPeriod: datapackage.fiscalPeriod
+      ? {
+          start: datapackage.fiscalPeriod.start
+            ? datapackage.fiscalPeriod.start
+            : null,
+          end: datapackage.fiscalPeriod.end
+            ? datapackage.fiscalPeriod.end
+            : null,
+        }
+      : null,
+    readme: datapackage.readme ? datapackage.readme : '',
+    datapackage,
+  };
+}