Marketing Hub: RBAC, i18n (AR/EN), tasks overhaul, team/user merge, tutorial

Features:
- Full RBAC with 3 roles (superadmin/manager/contributor)
- Ownership tracking on posts, tasks, campaigns, projects
- Task system: assign to anyone, filter combobox, visibility scoping
- Team members merged into users table (single source of truth)
- Post thumbnails on kanban cards from attachments
- Publication link validation before publishing
- Interactive onboarding tutorial with Settings restart
- Full Arabic/English i18n with RTL layout support
- Language toggle in sidebar, IBM Plex Sans Arabic font
- Brand-based visibility filtering for non-superadmins
- Manager can only create contributors
- Profile completion flow for new users
- Cookie-based sessions (express-session + SQLite)

server/node_modules/node-gyp/docs/Common-issues.md

@@ -0,0 +1,14 @@
+## Python Issues OSX
+
+Make sure you are using the native Python version in OSX.  If you use a MacPorts of HomeBrew version, you may run into problems.
+
+If you have issues with `execvp`, be sure to check your `$PYTHON` environment variable.  If it is not set to the native version, unset it and try again.
+
+Notes: https://gist.github.com/erichocean/5177582
+
+## npm ERR! `node-gyp rebuild`(Windows)
+* just install the build tools from [here](https://visualstudio.microsoft.com/thank-you-downloading-visual-studio/?sku=BuildTools)
+Please note the version as is required in below command e.g **2017**
+* Launch cmd, run `npm config set msvs_version 2017`
+* close and open new CMD/terminal and all is well :100: 
+