minor clean up of repo

[Blargian]

Summary

Minor repo cleanup:

• add a contributing folder to house anything contribution related. Move CODE_OF_CONDUCT.md to this folder.
• add templates_and_guides directory to above mentioned folder to house any templates or guides, added a readme to explain the purpose.
• move scripts in root to /scripts
• move the image in the root to /images
• delete pagerank.csv (not sure if this is needed or not?)
• rename copyClickhouseRepoDocs.sh to copyClickHouseRepoDocs.sh
• Fix up issues with copyClickHouseRepDocs.sh and autogenerate-settings.sh caused by moving the files.
• Add basic error handling to the scripts above.

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/en/integrations/index.mdx