Streamline "Contribute to Blockly" docs #10137

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Suggested content

The current Contribute to Blockly pages are verbose and there are many different pages. This makes it difficult for experienced developers to get critical information about our processes. This also makes it difficult for newer developers, who are hit with an overload of information.

The docs can be streamlined to:

• Slightly reduce the total number of pages in each section by combining short/highly related pages
• Reduce verbosity of existing docs to make processes clearer

Additional context

Related to #7236 which outlines the need for better description of code architecture in contributing docs