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/baked-goods/README.md

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+# Baked Goods
+
+Breads, muffins, and bars.
+
+- [Zucchini and Chocolate Chip Bread](zucchini-and-chocolate-chip-bread.md)
+- [Carrot, Fig, Macadamia Bread/Bricks](carrot-fig-macadamia-bread.md)
+- [Purple Potato, Pecan Bread/Bricks](purple-potato-pecan-bread.md)
+- [Chocolate Mint Protein Gunk Bars](chocolate-mint-protein-gunk-bars.md)
+- [Banana Chocolate Chip Bread](banana-chocolate-chip-bread.md)

src/recipes/baked-goods/banana-chocolate-chip-bread.md

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+*Source: Abby*
+
+## Ingredients
+- Ripe bananas, mashed (3-4)
+- Flour
+- Sugar or sweetener
+- Eggs
+- Butter or oil
+- Chocolate chips
+- Baking soda
+- Vanilla extract
+- Salt
+- Optional: walnuts

src/recipes/baked-goods/carrot-fig-macadamia-bread.md

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+*Source: Abby*
+
+## Ingredients
+- Grated carrots
+- Dried figs, chopped
+- Macadamia nuts, chopped
+- Flour
+- Eggs
+- Oil or butter
+- Sweetener
+- Baking powder
+- Spices (cinnamon, nutmeg, ginger)
+- Vanilla extract
+- Salt

src/recipes/baked-goods/chocolate-mint-protein-gunk-bars.md

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+*Source: Abby*
+
+## Ingredients
+- Protein powder (chocolate)
+- Oats
+- Nut butter (peanut or almond)
+- Honey or maple syrup
+- Cocoa powder
+- Peppermint extract
+- Dark chocolate chips
+- Salt
+
+## Instructions
+1. Mix all ingredients until well combined.
+2. Press into pan lined with parchment.
+3. Refrigerate until firm, cut into bars.
+4. Store in fridge or freezer.

src/recipes/baked-goods/purple-potato-pecan-bread.md

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+*Source: Abby*
+
+## Ingredients
+- Purple potatoes, cooked and mashed
+- Pecans, chopped
+- Flour
+- Eggs
+- Oil or butter
+- Sweetener
+- Baking powder
+- Cinnamon
+- Vanilla extract
+- Salt

src/recipes/baked-goods/zucchini-and-chocolate-chip-bread.md

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+*Source: Abby*
+
+## Ingredients
+- Grated zucchini (about 2 cups)
+- Flour
+- Sugar or sweetener
+- Eggs
+- Oil or butter
+- Chocolate chips
+- Baking soda
+- Cinnamon
+- Vanilla extract
+- Salt