remove rc-slider types

[huss]

Description

PR #1249 removed rc-slider but the types are still there. This removes them. This should eliminate the need for PR #1297.

Type of change

• Note merging this changes the database configuration.
• This change requires a documentation update

Checklist

• I have followed the OED pull request ideas
• I have removed text in ( ) from the issue request
• You acknowledge that every person contributing to this work has signed the OED Contributing License Agreement and each author is listed in the Description section.

Limitations

None known

[huss]

This should be a straightforward change to remove an unused package with all checks passing. Thus, I am approving my own work.