🔨 Switch FilterOptions to use useOvermind

[MichaelDeBoey]

Resubmission of #2857

Follow-up of #2650

Things I did extra:

• Change blacklistedTemplateAdded & blacklistedTemplateRemoved's signatures to accept a string instead of { template: string }, because they only have 1 argument
• Change blacklistedTemplatesChanged's signature to accept a string[] instead of { templates: string[] }, because it only has 1 argument
• Put all styles into the elements.ts file
• Export FilterOptions by a named export instead of a default export
• Derive Filters' props type from child components
• Derive Content's props type from child components
• Delete types.ts and make Template a private type from FilterOptions

[lbogdan]

Build for latest commit 5e32256 is at https://pr3216.build.csb.dev/s/new.