Integrate flowershow packages (#923)

* [packages][m]: mv @flowershow/core package here

* [packages/core][xs]: rename to @portaljs/core

* [package.json][xs]: setup npm workspaces

* [packages/core][xs]:replace deprecated rollup executor

* [core/package.json][s]: fix mermaid versions

* [core/tsconfig][xs]: rm extends

* [core/jest.config][xs]: rm coverageDirectory

* [core/package.json][xs]: install core-js

* [packages.json][s]:use same version for all nrwl packages

* [core/.eslintrc][xs]: adjust ignorePatterns

* [core/project.json][xs]: rm publish targets

* [packages][m]: mv @flowershow/remark-wiki-link here

* [packages][m]: mv @flowershow/remark-wiki-link here

* [packages][m]: mv @flowershow/remark-embed here

* [remark-callouts/project.json][xs]: adjst test pattern

* [package.json][s]: install missing deps

* [remark-callouts][xs]: adjst fields in package.json

* [remark-callouts][s]: rm pubish targets and adjst build executor

* [remark-embed/jest.config][xs]: rm unknown option coverageDirectory

* [remark-embed][xs]: rm publish targets

* [remark-embed][s]: rename to @portaljs/remark-embed

* [remark-wiki-link/eslintrc][xs]:adjst ignorePatterns

* [package.json][xs]: install missing deps

* [remark-wiki-link/test][xs]:specify format

- also temporarily force any type on htmlExtension

* [remark-wiki-link/README][xs]: replace @flowershow with @portaljs

* [remark-wiki-link][xs]:rm old changelog

* [remark-wiki-link][xs]: adjst package.json

* [remark-wiki-link/project.json][xs]: rm publish targets

* [core][s]: rm old changelog

* [core/README][xs]:correct scope name

* [remark-callouts/README][xs]: add @portaljs to pckg name

* [remark-embed/README][xs]: add @portaljs to pckg name

* [package-lock.json][xs]: refresh after rebasing on main

packages/remark-embed/src/index.ts

@@ -0,0 +1 @@
+export { default } from "./lib/remark-embed";

packages/remark-embed/src/lib/remark-embed.ts

@@ -0,0 +1,49 @@
+import { visit } from "unist-util-visit";
+
+function transformer(tree) {
+  visit(tree, "paragraph", (node) => {
+    visit(node, "text", (textNode) => {
+      if (
+        textNode.value.includes("https://www.youtube.com") &&
+        !textNode.value.includes("\n")
+      ) {
+        const urlSplit = textNode.value.split(/[=&]+/);
+        const iframeUrl = `https://www.youtube.com/embed/${urlSplit[1]}`;
+        Object.assign(node, {
+          ...node,
+          type: "element",
+          data: {
+            hProperties: {
+              style: "position:relative;padding-bottom:56.25%",
+            },
+          },
+          children: [
+            {
+              ...textNode,
+              type: "element",
+              tagName: "iframe",
+              data: {
+                hName: "iframe",
+                hProperties: {
+                  style:
+                    "position:absolute;top:0;left:0;width:100%;height:100%",
+                  src: iframeUrl,
+                  allowfullscreen: true,
+                  frameborder: "0",
+                  allow:
+                    "accelerometer autoplay clipboard-write encrypted-media gyroscope picture-in-picture",
+                },
+              },
+            },
+          ],
+        });
+      }
+    });
+  });
+}
+
+function attacher() {
+  return transformer;
+}
+
+export default attacher;