[Roadmap] Improve Core reference section

[matks]

• [x] Coding standards ✅
• [x] Naming conventions ✅
• [ ] Architecture > Introduction 🟠
• [ ] Architecture > File structure 🟠
• [ ] Architecture > Legacy 🟠
• [ ] Architecture > Modern 🟠
• [ ] Architecture > Migration guide 🟠
• [ ] Architecture > Domain-driven architecture 🟠
• [ ] Architecture > Cache ➡️
• [x] Database ✅
• [ ] Orders lifecycle 🟠 (nice example https://docs.sylius.com/en/latest/book/index.html#carts-orders)
• [ ] Products workflow / structure / lifecycle 🔴
  • [ ] https://github.com/PrestaShop/docs/issues/1085 (nice example https://docs.sylius.com/en/latest/book/index.html#products)
• [x] Page Reference > BO pages > Order ✅
• [ ] Page Reference > BO pages > Product 🟠
• [ ] Page Reference 🔴 (we should explain some more important BO pages like dashboard)
• [ ] Components section ==> https://github.com/PrestaShop/docs/issues/1325
• [ ] Internationalization > Translation 🟠 (content is quite complete but structure is complex)
  • https://github.com/PrestaShop/docs/issues/1316
• [x] Internationalization > Localization packs ✅
  • [ ] https://github.com/PrestaShop/docs/issues/1068
• [x] Internationalization > RTL Languages ✅
• [x] How to compile assets ➡️
• [x] Sending emails ➡️
• [x] UI Kit ✅
• [x] Native modules ✅
• [x] Upgrade module ✅
• [ ] Multistore 🟠 (see nice example https://www.drupal.org/docs/multisite-drupal)
• [ ] Security 🔴

➡️= must move or must be removed ✅ = quite complete (although can always be improved) 🟠 = can be improved 🔴 = does not exist