feat!: Split site into public and private sections

Moved the Copper Chronicle and resume into a private git submodule
(src/private), visible only to authenticated users. Added a lock symbol
to the mdbook sidebar for restricted sections. Reorganized nginx/nix
configuration files into a dedicated folder. Removed one-line descriptions
from the menu. Reduced custom CSS to better align the main website's theme
with mdbook's native styling. Personalized the index and blog introduction
pages.

src/recipes/earth-day/README.md

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+# Earth Day Recipes
+
+Made for housemates Ray and Will on April 27th, 2024.
+
+- [Goat Root Stir Fry](goat-root-stir-fry.md)
+- [Compote](compote.md)

src/recipes/earth-day/compote.md

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+*Source: Matt*
+
+## Ingredients
+- One pack raspberries
+- One pack blueberries
+- One pack blackberries
+- 3 tbsp manuka honey
+
+## Instructions
+1. Add all berries to a pot, fill with water until submerged.
+2. Bring to a boil, simmer for 20 minutes.
+3. Strain or blend, add to pitcher, mix in honey while hot.

src/recipes/earth-day/goat-root-stir-fry.md

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+*Source: Matt*
+
+## Ingredients
+
+**The Meat:**
+- Lamb loin chop
+- Lamb shoulder chop
+- Lamb leg chop
+
+**The Base:**
+- 1 bunch collard greens
+- 1 bunch chard
+- Coconut aminos
+
+**The Roots:**
+- One turnip
+- One radish
+- One beet
+- One rutabaga
+- One parsnip
+- One (midsize) carrot
+
+**Seasoning (in decreasing order):**
+- Nutritional yeast
+- Dill
+- Cumin
+- Coriander
+- Ginger
+- Cardamom