Clean up Developer Guide (#108259)

* update plugin docs

* address code review feedback

dev_docs/getting_started/add_data.mdx

@@ -0,0 +1,37 @@
+---
+id: kibDevAddData
+slug: /kibana-dev-docs/tutorial/sample-data
+title: Add data
+summary: Learn how to add data to Kibana
+date: 2021-08-11
+tags: ['kibana', 'onboarding', 'dev', 'architecture', 'tutorials']
+---
+
+Building a feature and need an easy way to test it out with some data? Below are three options.
+
+## 1. Add Sample Data from the UI
+
+Kibana ships with sample data that you can install at the click of the button. If you are building a feature and need some data to test it out with, sample data is a great option. The only limitation is that this data will not work for Security or Observability solutions (see [#62962](https://github.com/elastic/kibana/issues/62962)).
+
+1. Navigate to the home page.
+2. Click **Add data**.
+3. Click on the **Sample data** tab.
+4. Select a dataset by clicking on the **Add data** button.
+
+![Sample Data](../assets/sample_data.png)
+
+## CSV Upload
+
+1. If you don't have any data, navigate to Stack Management > Index Patterns and click the link to the uploader. If you do have data, navigate to the **Machine Learning** application.
+2. Click on the **Data Visualizer** tab.
+3. Click on **Select file** in the **Import data** container.
+
+![CSV Upload](../assets/ml_csv_upload.png)
+
+## makelogs
+
+The makelogs script generates sample web server logs. Make sure Elasticsearch is running before running the script.
+
+```sh
+node scripts/makelogs --auth <username>:<password>
+```

dev_docs/getting_started/dev_welcome.mdx

@@ -14,7 +14,8 @@ Kibana ships with many out-of-the-box capabilities that can be extended and enha
 Recommended next reading:
 
 1. <DocLink id="kibDevTutorialSetupDevEnv" text="Set up your development environment" />
-2. Create a simple <DocLink id="kibHelloWorldApp" text="Hello World plugin"/>.
+2. Create a <DocLink id="kibHelloWorldApp" text="Hello World plugin"/>.
+3. <DocLink id="kibDevAddData" text="Add data" />.
 
 Check out our <DocLink id="kibDevDocsApiWelcome" text="API documentation" /> to dig into the nitty gritty details of
 every public plugin API.

dev_docs/getting_started/hello_world_plugin.mdx

@@ -27,7 +27,7 @@ $ mkdir hello_world
 $ cd hello_world
 ```
 
-2. Create the <DocLink id="kibDevTutorialBuildAPlugin" section="1-kibanajson" text="kibana.json manifest file"/>.
+2. Create the <DocLink id="kibDevAnatomyOfAPlugin" section="kibanajson" text="kibana.json manifest file"/>.
 
 ```
 $ touch kibana.json
@@ -44,7 +44,7 @@ and add the following:
 }
 ```
 
-3. Create a `tsconfig.json` file.
+3. Create a <DocLink id="kibDevAnatomyOfAPlugin" section="tsconfigjson" text="tsconfig.json file" />.
 
 ```
 $ touch tsconfig.json
@@ -56,8 +56,7 @@ And add the following to it:
 {
   "extends": "../../tsconfig.json",
   "compilerOptions": {
-    "outDir": "./target",
-    "skipLibCheck": true
+    "outDir": "./target/types",
   },
   "include": [
     "index.ts",
@@ -67,11 +66,14 @@ And add the following to it:
     "server/**/*.ts",
     "../../typings/**/*"
   ],
-  "exclude": []
+  "exclude": [],
+  "references": [
+    { "path": "../../src/core/tsconfig.json" }
+  ]
 }
 ```
 
-4. Create a <DocLink id="kibDevTutorialBuildAPlugin" section="2-publicindexts" text="`public/plugin.tsx` file "/>.
+4. Create a <DocLink id="kibDevAnatomyOfAPlugin" section="publicindexts" text="`public/plugin.tsx` file "/>.
 
 ```
 $ mkdir public
@@ -104,7 +106,7 @@ export class HelloWorldPlugin implements Plugin {
 }
 ```
 
-5. Create a <DocLink id="kibDevTutorialBuildAPlugin" section="3-publicplugints" text="`public/index.ts` file "/>.
+5. Create a <DocLink id="kibDevAnatomyOfAPlugin" section="publicplugints" text="`public/index.ts` file "/>.
 
 ```
 $ touch index.ts