feat: add Lemon Extract. Fixes #236.

cook/ingredients/extracts/Lemon Extract.cook

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+>> source: https://www.biggerbolderbaking.com/homemade-extracts/
+>> serves: 2 oz
+>> total time: 5-6 weeks
+
+Peel thin strips of zest from your @lemon{1}.
+
+Place zest into your #2-fl. oz glass bottle{}.
+
+Add @vodka{2%oz}, filling up to the neck of the bottle.
+
+Every few days, tilt your bottle upside down to gently mix the liquid inside.
+
+After 5-6 weeks, you have extract!

docs/ingredients/extracts/lemon-extract.md

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+# :lemon: Lemon Extract
+
+![Lemon Extract](../../assets/images/lemon-extract.jpg)
+
+| :fork_and_knife_with_plate: Serves | :timer_clock: Total Time |
+|:----------------------------------:|:-----------------------: |
+| 2 oz | 5-6 weeks |
+
+## :salt: Ingredients
+
+- :lemon: 1 lemon
+- :sake: 2 oz vodka
+
+## :cooking: Cookware
+
+- 1 2-fl. oz glass bottle
+
+## :pencil: Instructions
+
+### Step 1
+
+Peel thin strips of zest from your lemon.
+
+### Step 2
+
+Place zest into your 2-fl. oz glass bottle.
+
+### Step 3
+
+Add vodka, filling up to the neck of the bottle.
+
+### Step 4
+
+Every few days, tilt your bottle upside down to gently mix the liquid inside.
+
+### Step 5
+
+After 5-6 weeks, you have extract!
+
+## :link: Source
+
+- <https://www.biggerbolderbaking.com/homemade-extracts/>