Move lost grapesjs documentation to docs, small improves

docs/components/grapesjs.rst

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+GrapesJS Builder
+################
+
+Currently, Mautic uses the GrapesJS Builder for Emails and Landing pages. 
+
+Setup 
+*****
+
+.. code-block:: BASH
+
+    npm install
+
+.. vale off
+
+Configure Babel, ESLint, Prettier
+=================================
+
+.. vale on
+
+Use the template files provided. For example .eslintrc.temp
+
+How to test standalone
+**********************
+
+.. code-block:: BASH
+
+    npm run start-helloWorld
+    or
+    npm run start-mautic
+
+In order for ``start-mautic`` to work, a running DDEV container has to be present. 
+
+If you are using another development environment you need to update some paths in ``Demo/mautic/index.html``.
+
+How to build for production
+***************************
+
+.. code-block:: BASH
+
+    npm run build
+
+Code architecture
+*****************
+
+There is PHP and the JavaScript code.
+
+All the JavaScript code lives in the Assets/library folder. This handles the UI of the builder.
+
+In addition to the code in this repository, there is also the :xref:`GrapesJS Preset`. 
+
+This repository handles the basic Mautic specific code. The general idea is that this preset repository is a base for various Mautic builder Plugins. 
+
+E.g one where the Rich Text Editor is CKEditor, or where there is some very customer or industry specific features.
+
+```
+- It's a pack of configurable feautures:
+- Adds the function to edit source code
+- Extends the original image and add a confirm dialog before removing it
+- Add the option to hide/show the Layers Manager
+- Add the option to enable/disable the import code button
+- Moves the Settings panel inside Style Manager panel
+- Opens the Block Manager at launch
+- Add Dynamic Content Block for HTML used in Mautic
+```
+
+Issues
+******
+
+Report issues in the main Mautic repository, labelled as :xref:`GrapesJS issue queue`
+
+PRs
+***
+
+Contributions to improve the GrapesJS Plugin happen in the main Mautic repository as :xref:`GitHub PRs`

docs/links/github_mautic_prs.py

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+from . import link
+
+link_name = "GitHub PRs" 
+link_text = "GitHub PRs" 
+link_url = "https://github.com/mautic/mautic/pulls" 
+
+link.xref_links.update({link_name: (link_text, link_url)})

docs/links/grapesjs_issues.py

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+from . import link
+
+link_name = "GrapesJS issue queue" 
+link_text = "GrapesJS builder issues" 
+link_url = "https://github.com/mautic/mautic/issues?q=is%3Aopen+is%3Aissue+label%3Abuilder-grapesjs" 
+
+link.xref_links.update({link_name: (link_text, link_url)})

docs/links/grapesjs_preset.py

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+from . import link
+
+link_name = "GrapesJS Preset" 
+link_text = "GrapesJS Preset" 
+link_url = "https://github.com/mautic/grapesjs-preset-mautic" 
+
+link.xref_links.update({link_name: (link_text, link_url)})