docs: fixes in shipping, payment, and other documentations

* added integration

* add segment for API reference

* updated frontend checkout flow

* added paypal documentation

* Improve storefront quickstart documents

* added documentation for entities

* docs: disable running tests for docs

* added docs contribution guidelines

* Use npm2yarn where missing

* added additional steps section

* added notification overview

* Added guidelines for sidebar labels

* added how to create notification provider

* fixes

* fixes for payment provider

* fixes

* chore(deps): bump sqlite3 from 5.0.2 to 5.0.3 (#1453)

Bumps [sqlite3](https://github.com/TryGhost/node-sqlite3) from 5.0.2 to 5.0.3.
- [Release notes](https://github.com/TryGhost/node-sqlite3/releases)
- [Changelog](https://github.com/TryGhost/node-sqlite3/blob/master/CHANGELOG.md)
- [Commits](https://github.com/TryGhost/node-sqlite3/compare/v5.0.2...v5.0.3)

* fix: Issue with cache in CI pipeline

* Use npm2yarn where missing

* added integration

* add segment for API reference

* fix double segment

* updated frontend checkout flow

* added documentation for entities

* added docs contribution guidelines

* Added guidelines for sidebar labels

* added additional steps section

* added notification overview

* added how to create notification provider

* chore: Add issue template for bug reports (#1676)

* chore: Add issue template for feature requests (#1679)

* fixes

* fixes for payment provider

* fixes

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Oliver Windall Juhl <59018053+olivermrbl@users.noreply.github.com>

docs/content/advanced/backend/upgrade-guides/1-3-0.md

@@ -58,7 +58,7 @@ const dotenv = require('dotenv')
 
 This new version of Medusa allows store operators to adjust line items in an order or a swap which provides more customization capabilities.
 
-It introduces a new model `LineItemAdjustment` which gives more flexibility to adjust the pricing of line items in a cart, order, or swap. A discount can be added, removed, or modified and the price will reflect on the total calculation of the cart, order, or swap.
+It introduces a new entity `LineItemAdjustment` which gives more flexibility to adjust the pricing of line items in a cart, order, or swap. A discount can be added, removed, or modified and the price will reflect on the total calculation of the cart, order, or swap.
 
 This also introduces an optimization to the calculation of totals, as it is no longer necessary to calculate the discounts every time the totals are retrieved.
 
@@ -76,7 +76,7 @@ node ./node_modules/@medusajs/medusa/dist/scripts/line-item-adjustment-migration
 
 This new version of Medusa holds advanced promotions functionalities to provide store operators with even more customization capabilities when creating discounts. You can now add even more conditions to your discounts to make them specific for a set of products, collections, customer groups, and more.
 
-This change required creating a new model `DiscountCondition` which belongs to `DiscountRule` and includes a few relationships with other models to make the aforementioned feature possible.
+This change required creating a new entity `DiscountCondition` which belongs to `DiscountRule` and includes a few relationships with other entities to make the aforementioned feature possible.
 
 ### Actions Required