Add endpoint to fetch filters in JSON format

While this is an API endpoint consumed by the bot, keep it in the
`resources` app instead of the `api` app, as all the logic and data for
resources is contained within the `resources` app and we don't want to
start messing around with that.

The response format from the endpoint is as follows:

    {
        "topics": [
            "algorithms-and-data-structures",
            "data-science",
            "databases",
            "discord-bots",
            "game-development",
            "general",
            "microcontrollers",
            "security",
            "software-design",
            "testing",
            "tooling",
            "user-interface",
            "web-development",
            "other"
        ],
        "payment_tiers": [
            "free",
            "paid",
            "subscription"
        ],
        "type": [
            "book",
            "community",
            "course",
            "interactive",
            "podcast",
            "project-ideas",
            "tool",
            "tutorial",
            "video"
        ],
        "difficulty": [
            "beginner",
            "intermediate"
        ]
    }

Closes #710.

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