Add stub pages for some routes

src/routes/admin/userdata/+page.svelte

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+<h1>User Data</h1>

src/routes/admin/users/+page.svelte

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+<h1>User Management</h1>

src/routes/leaderboard/+page.svelte

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+<h1>Leaderboard</h1>

src/routes/racepicks/+page.svelte

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+<h1>Race Picks</h1>

src/routes/rules/+page.svelte

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+<h1>Rules</h1>

src/routes/seasonpicks/+page.svelte

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+<h1>Season Picks</h1>

src/routes/statistics/+page.svelte

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+<h1>Statistics</h1>