Add Foursquare dataset + general improvements

[Blargian]

Summary

• Adds the Foursquare dataset to example datasets
• Moves images for example-datasets to static directory
• Generate the table of contents for example data-sets automatically

Additionally, but unrelated:

• Fixes an issue where local build fails if you run it a second time as autogenerated content is appended to the end of the beta-and-experimental-features.md file. In production this is fine because we start from scratch each time but locally this causes duplicated content in a file and fails the build on anchorChecker due to duplicate anchor ids.

Solution:
Added support for <--AUTOGENERATED_START--><--AUTOGENERATED_END--> tags. The script now looks for those tags and just replaces the content in between them so we don't get multiple copies if the script is run more than once.

Checklist

• Delete items not relevant to your PR
• URL changes should add a redirect to the old URL via https://github.com/ClickHouse/clickhouse-docs/blob/main/docusaurus.config.js
• If adding a new integration page, also add an entry to the integrations list here: https://github.com/ClickHouse/clickhouse-docs/blob/main/docs/integrations/index.mdx

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[Blargian]

We should strictly prefer this in our docs, but it only works when structure is aligned to disk