Cleanup

Author: ondrejmirtes

website/src/developing-extensions/core-concepts.md

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 title: Core Concepts
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-<div class="bg-yellow-100 border-l-4 border-yellow-500 text-yellow-700 p-4 mb-4" role="alert">
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-Please note that this website section is under development as of June 2020. The plan is to write about development of custom extensions in much more detail. Thanks for understanding.
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-</div>
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-<div class="bg-yellow-100 border-l-4 border-yellow-500 text-yellow-700 p-4 mb-4" role="alert">
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-Be aware that PHPStan configuration settings are being cached. You might need to clear this cache when working on an extension in order for your phpstan instance to acknowledge your changes.
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-This cache can be cleared the `clear-result-cache` command. [Learn more »](/user-guide/command-line-usage#clearing-the-result-cache)
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-Result cache also gets disabled when running with [`--debug`](/user-guide/command-line-usage#--debug).
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-</div>
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 Abstract Syntax Tree
 -----------------
 

website/src/developing-extensions/extension-types.md

@@ -2,12 +2,6 @@
 title: Extension Types
 ---
 
-<div class="bg-yellow-100 border-l-4 border-yellow-500 text-yellow-700 p-4 mb-4" role="alert">
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-Please note that this website section is under development as of May 2021. The plan is to write about development of custom extensions in much more detail. Thanks for understanding.
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-</div>
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 PHPStan's behavior can be customized in various ways.
 
 [Learn about core concepts »](/developing-extensions/core-concepts)