Improved theming api and docs

[csansoon]

Describe your changes

Following the components integration in the React package, we need a better API for custom theming, along with a good documentation.

• Removed the need for adding a "name" and "label" to a Theme. It now it defined just by its colors.
• Color variables can now be any CSS color definition, instead of just hsl values.
• Defining a new Theme now only requires a partial definition of the object, which will be extended from the default theme.
• Added a way to change the selected Theme in React, using an existing or new theme.
• Added docs on how this theme is defined and how to modify it in the React package.

Nex wagon in TRENECITO

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 4631700e08f1161944a237ee3ba6d4a987e3c2fe

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 5 packages

| Name | Type | | --------------------- | ----- | | @latitude-data/svelte | Minor | | @latitude-data/react | Minor | | @latitude-data/client | Minor | | @latitude-data/server | Patch | | example-react | Patch |

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