Add news reader (#3445)

* add model for feed entries

* add task to update feed entries

* Add API routes

* Fix name in model

* rename model

* fix read endpoint

* reduce duplication in NewsFeed API endpoints

* reduce duplicated code

* add ui elements to index

* add missing migrations

* add ressource route

* add new model to admin

* reorder fields

* format timestamp

* make title linked

* reduce migrations to 1

* fix merge

* fix js style

* add model to ruleset

InvenTree/templates/js/translated/news.js

@@ -0,0 +1,58 @@
+{% load i18n %}
+{% load inventree_extras %}
+
+/* exported
+    loadNewsFeedTable,
+*/
+
+/*
+ * Load notification table
+ */
+function loadNewsFeedTable(table, options={}, enableDelete=false) {
+    setupFilterList('news', table);
+
+    $(table).inventreeTable({
+        url: options.url,
+        name: 'news',
+        groupBy: false,
+        queryParams: {
+            ordering: 'published',
+        },
+        paginationVAlign: 'bottom',
+        formatNoMatches: function() {
+            return '{% trans "No news found" %}';
+        },
+        columns: [
+            {
+                field: 'pk',
+                title: '{% trans "ID" %}',
+                visible: false,
+                switchable: false,
+            },
+            {
+                field: 'title',
+                title: '{% trans "Title" %}',
+                sortable: 'true',
+                formatter: function(value, row) {
+                    return `<a href="` + row.link + `">` + value + `</a>`;
+                }
+            },
+            {
+                field: 'summary',
+                title: '{% trans "Summary" %}',
+            },
+            {
+                field: 'author',
+                title: '{% trans "Author" %}',
+            },
+            {
+                field: 'published',
+                title: '{% trans "Published" %}',
+                sortable: 'true',
+                formatter: function(value) {
+                    return renderDate(value);
+                }
+            },
+        ]
+    });
+}