Docs: change analysis docs structure

docs/analysis/development-process/code-style.md

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+# Analysis API Code Style
+
+This is a code style for Analysis API modules which are located in [analysis directory](../../../analysis)
+
+* Please, follow [official Kotlin code style](https://kotlinlang.org/docs/coding-conventions.html).
+* IntelliJ IDEA is set up for these coding guidelines and the default formatter will help you a lot.
+* Consider using introducing explicit lambda parameter instead of implicit `it` parameter when:
+    * The lambda is multi-line, so includes multiple statements
+    * The `it` parameter is used multiple times inside lambda
+* Do not overuse `let`, `also`, `apply` and similar functions. 
+  It seems cool to write a complex multiline function as a single expression but please, do not sacrifice code readability because of that.