Feat: meta-tags are now configurable

[TWinsnes]

Changes

Added a new params.head section to the theme config.toml with the default values for meta-tags. The user can override these in their hugo.toml file.

For individual docs pages, the meta-tags will use front-mater values first, then fall back to site defaults if they have not been set

This PR resolves https://github.com/colinwilson/lotusdocs/issues/243

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