Clean up Custom DC HTML templates and CSS after site redesign

[kmoscoe]

This PR does the following

• Rewrite top-level comment in base.html and point to Docsite (also in homepage.html)
• Chang title bar to use the NAME variable instead of hard-coded "Custom Data Commons".
• Change name in custom_test.py to unbreak several Webdriver tests.
• Remove unused scripts from bottom of base.html
• Remove all unused styles from overrides.css
• Remove Biomed example from browser landing page (that data is going away)

[gemini-code-assist]

Summary of Changes

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This pull request significantly improves the documentation within the base.html template by providing clearer and more comprehensive comments. The changes aim to enhance developer understanding of template variables and blocks, making the template easier to use and maintain for current and future contributors.

Highlights

• Documentation Clarity: Expanded comments in base.html to provide more detailed explanations for required and optional template variables, including their specific usage (e.g., title for browser title bar, main_id and page_id for CSS).
• Template Block Explanation: Clarified the purpose of template blocks, renaming 'Blocks to override' to 'Blocks to include (used for CSS)' for better understanding of their function.

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[gemini-code-assist]

Code Review

This pull request updates the comments in the base.html template to provide more detailed explanations for the required and optional variables. The changes are helpful, but I've pointed out one line where the new description is technically inaccurate regarding Jinja2 terminology and the purpose of the blocks. I've suggested a correction to improve clarity and correctness.