Add v3.0.0 release notes (#1280)

* add release notes for v3.0.0

* fix spacing

* move removed after changed

* update spacing

* Remove douple spaces

release-notes.md

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+Dawn 3.0.0 introduces a new suite of theme style settings to let you customize the overall look and feel of your store.
+
+### Added
+- Layout theme settings let you change the amount of spacing between each section, as well as the spacing between repeated items within sections.
+- New theme settings let you change the look of your buttons, variant pills, inputs, badges, media, content containers, drawers, dropdowns, and pop-ups by editing their borders, corners, and shadow effects. 
+- New theme settings on cards (product cards, collection cards, blog cards, collage section cards) let you pick from different styles, define text alignment, and edit their borders, corners, and shadow effects. 
+- The new collapsible content section lets you add content to your pages using a layout composed of collapsible rows. It’s ideal to build a frequently asked questions page, or add a section with secondary information to your product pages.
+- We added new icon options to the collapsible row block on the product page. 
+- We added a new color scheme setting on many sections, allowing more flexibility to customize the look of your store. Find it in: blog posts, collage, collapsible content, collection banner, contact form, custom liquid, featured collection, featured product, multicolumn, page, and product recommendations. 
+- New top and bottom padding settings were added on most sections, letting you define the amount of space at the top and bottom of the section. Find it in: blog posts, cart items, collage, collapsible content, collection list, collection product grid, contact form, custom liquid, email signup, featured collection, featured product, footer, image with text, search results, multicolumn, product information, page, product recommendations, rich text, and video.
+- You can now define the amount of space between your header and the following section with a new bottom margin setting on the header section.
+- You can now define the amount of space between your footer and the previous section with a new top margin setting on the footer section. 
+- We added support for app blocks to the featured product section.
+
+### Changed
+- The page width layout setting where you set the maximum width of your online store pages has changed to offer a range from 1000px to 1600px. 
+
+### Removed
+- Important: Dawn no longer includes the Craft preset. If you’re interested in achieving the Craft look, you can now install the new [Craft theme](https://themes.shopify.com/themes/craft).