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/core/src/ui/Base/CustomLink.tsx

@@ -0,0 +1,57 @@
+import Link from "next/link.js";
+import { Tooltip } from "../Tooltip";
+import TwitterEmbed from "./TwitterEmbed";
+
+// TODO it's a mess, move twitter embeds support to remark-embed
+const TWITTER_REGEX =
+  /^https?:\/\/twitter\.com\/(?:#!\/)?(\w+)\/status(es)?\/(\d+)/;
+
+interface Props {
+  href: string;
+  data: any;
+  usehook: any;
+  preview: boolean;
+  children: React.ReactNode;
+  className?: string;
+  [x: string]: unknown;
+}
+
+export const CustomLink: React.FC<Props> = ({
+  data,
+  usehook,
+  preview,
+  ...props
+}) => {
+  const { href } = props;
+  const isInternalLink = !href.startsWith("http");
+  // eslint-disable-next-line no-useless-escape
+  const isHeadingLink = href.startsWith("#");
+  const isTwitterLink = TWITTER_REGEX.test(href);
+
+  // Use next link for pages within app and <a> for external links.
+  // https://nextjs.org/learn/basics/navigate-between-pages/client-side
+  if (isInternalLink) {
+    if (preview && !isHeadingLink) {
+      return (
+        <Tooltip
+          {...props}
+          data={data} // TODO again, why do we pass all documents here?!
+          usehook={usehook}
+          render={(tooltipTriggerProps) => <Link {...tooltipTriggerProps} />}
+        />
+      );
+    } else {
+      return <Link {...props} />;
+    }
+  }
+
+  if (isTwitterLink) {
+    return <TwitterEmbed url={href} {...props} />;
+  }
+
+  return (
+    <a target="_blank" rel="noopener noreferrer" {...props}>
+      {props.children}
+    </a>
+  );
+};