chore: Improved onboarding docs

server/onboarding/❤️ Support.md

@@ -1,6 +1,8 @@
-We hate bugs as much as you and do everything possible to keep the app bug-free. Help us out by getting in touch with the team if you see any problems with Outline. You can email [hello@getoutline.com](mailto:hello@getoutline.com) directly and we’ll get back to you (hopefully with a fix!) as soon as possible.
+We hate bugs as much as you and do everything possible to keep the application bug-free and performant. If you see any problems with Outline please get in touch with the team – you can email [hello@getoutline.com](mailto:hello@getoutline.com) directly and we’ll get back to you (hopefully with a fix!) as soon as possible.
 
-If you already have a GitHub account then you can also submit issues directly to the development team on our [open issue tracker](https://github.com/outline/outline/issues).
+## GitHub
+
+If you have a GitHub account then you can also submit issues directly to the development team on our [open issue tracker](https://github.com/outline/outline/issues).
 
 ## Ideas
 

server/onboarding/👋 What is Outline.md

@@ -14,4 +14,4 @@ Outline allows you to organize documents in "collections", for example these cou
 
 ## Search
 
-Outline is built to be crazy fast, and that includes [search](/search). You can start searching from anywhere with the `CMD+K` shortcut. Then filter by time, author, and more to get to the info you need.
+Outline is built from the ground up to be really fast, and that includes [search](/search). You can start searching from anywhere with the `CMD+K` shortcut – then filter by time, author, and more to find the information you need. Or you can search from within Slack with the `/outline` slash command.

server/onboarding/📝 Our Editor.md

@@ -1,4 +1,4 @@
-The heart of Outline is the document editor. We let you write in the way that you prefer – be it Markdown, WYSIWYG, or taking advantage of the many keyboard shortcuts.
+The heart of Outline is the document editor. We let you write in whichever way you prefer – be it Markdown, WYSIWYG, or taking advantage of the many keyboard shortcuts.
 
 ![The formatting toolbar](https://s3.amazonaws.com/dev.beautifulatlas.com/uploads/e2b85962-ca66-4e4c-90d3-b32d30f0610c/754830c0-2aca-467c-82de-2fd6e990b696/Group.png)
 
@@ -13,3 +13,7 @@ If you’re comfortable writing markdown then all of the usual shortcuts are sup
 The editor supports a variety of content blocks including images, tables, lists, quotes, and more. You can also drag and drop images to include them in your document or paste a link to embed content from one of the many supported [integrations](https://www.getoutline.com/integrations)
 
 *Tip:* Headings are collapsible, just click the arrow to the left of any heading to temporarily hide the content below.
+
+## References
+
+Linking to another document automatically creates backlinks which are kept up-to-date and shown at the bottom of the document, so you can create a library of linked information and easily answer the question "which other documents link here?".

server/onboarding/🚀 Integrations & API.md

@@ -1,23 +1,23 @@
 ## Integrations
 
-Outline supports tons of the most popular tools on the market out of the box. Just paste links to a YouTube video, Figma design, or Realtimeboard to get instant live-embeds in your documents.
+Outline supports many of the most popular tools on the market without any additional settings or configuration. Just paste links to a YouTube video, Figma file, or Google Spreadsheet to get instant live-embeds in your documents. Take a look at the [integrations directory](https://www.getoutline.com/integrations) for a list of all of the tools that are supported.
 
-Our integration code is [open-source](https://github.com/outline/outline) and we encourage third party developers and the community to build support for additional tools! Find out more on our [integrations directory](https://www.getoutline.com/integrations).
+Our integration code is also [open-source](https://github.com/outline/outline) and we encourage third party developers and the community to build support for additional tools! 
 
 *Tip:* Most integrations work by simply pasting a link from a supported service into a document.
 
 ## Slack
 
-If your team is using Slack to communicate then you’ll definitely want to enable our [Slack App](https://getoutline.slack.com/apps/A0W3UMKBQ-outline) to get instant link unfurling for Outline documents and access to the `/outline` slash command to search your knowledgebase from within Slack.
+If your team is using Slack to communicate then you’ll definitely want to enable our [Slack Integration](/settings/integrations/slack) to get instant link unfurling for Outline documents and access to the `/outline` slash command to search your knowledgebase directly from Slack.
 
 ## API
 
-Have some technical skills? Outline is built on a fully featured RPC-style [API](https://www.getoutline.com/developers). Create (or even append to) documents, collections, provision users, and more programmatically. All documents are edited and stored in markdown format – try out this CURL request!
+Have some technical skills? Outline is built on a fully featured RPC-style [API](https://www.getoutline.com/developers). Create (or even append to) documents, collections, provision users, and more programmatically. All documents are edited and stored in markdown format – try out this example CURL request to get started:
 
 ```bash
 curl -XPOST -H "Content-type: application/json" -d '{
   "title": "My first document",
-  "text": "# My first document \n Hello from the API 👋",
+  "text": "Hello from the API 👋",
   "collectionId": "COLLECTION_ID", // find the collection id in the URL bar
   "token": "API_TOKEN", // get an API token from https://www.getoutline.com/settings/tokens
   "publish": true