chore: remove unsupported block types from the list of currently supported

[anonymousRecords]

Description of Changes

Here is reference: #25

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remove unsupported block types from the list of currently supported

• Currently, for all collection-related Notion block types, the Enum is set to collection_view, which indicates a need for more specific Block Type Enums. (Please refer to attached photo)
• After checking the official Notion API, we confirmed that Collections are not supported as block concepts in the Notion API.
• In our meeting, it was decided that we plan to support Collections in the future, so I've updated the documentation to reflect this.
• Also updated this information in the Supported Notion Block Types Progress issue.

Review point

• I've already removed the collection-related items from the markdown file, but I'm curious about your opinion on whether we need a separate note or explanation for this removal. What do you think?

[Moon-DaeSeung]

LGTM