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/config/default.ts

@@ -0,0 +1,31 @@
+export const defaultConfig = {
+  title: "Flowershow",
+  description: "",
+  showEditLink: false,
+  showToc: true,
+  showSidebar: false,
+  showLinkPreviews: true,
+  author: "",
+  authorLogo: "",
+  domain: "",
+  // Google analytics key e.g. G-XXXX
+  analytics: "",
+  // content source directory for markdown files
+  // DO NOT CHANGE THIS VALUE
+  // if you have your notes in another (external) directory,
+  // /content dir should be a symlink to that directory
+  content: "content",
+  avatarPlaceholder: "/_flowershow/avatarplaceholder.png",
+  contentExclude: [],
+  contentInclude: [],
+  blogDir: "blog",
+  peopleDir: "people",
+  // Theme
+  theme: {
+    default: "dark",
+    toggleIcon: "/_flowershow/theme-button.svg",
+  },
+  navLinks: [
+    // { href: '/about', name: 'About' },
+  ],
+};