fix: correct YAML frontmatter, convert images to proper WebP format

- Moved image: field from outside to inside YAML frontmatter (50 files)
- Converted all 56 non-WebP images to proper WebP format via ImageMagick
- Fixed Python shebangs for portability
- Updated source fields in 2 Task 3 recipes

Chana Chickpea Salad.cook

@@ -1,4 +1,3 @@
-image: https://roux.roo.lol/recipe-images/chana-chickpea-salad.webp
 ---
 title: Chana Salad
 description: I think my mom lied to me about this chana salaad. She said it was junk food so I would eat it, but now that I'm older I know better. After all, it's chickpeas and vegetables! But I'm glad my mom said whatever it took at the time to get me to eat it, because I love this salad. It is perfect for summer and is easy to make. Serve it as a side salad or as a main dish for a vegan meal. Adjust the cayenne as desired for your heat preference.
@@ -8,6 +7,7 @@ servings: 6
 category: side
 source: OCR
 tags: salad, indian, vegan, gluten-free, instant-pot, chickpea
+image: https://roux.roo.lol/recipe-images/chana-chickpea-salad.webp
 ---
 
 In the inner cooking pot of the #Instant Pot, combine the @chickpea{1%can}, @bay leaf{2}, and @water{4%cups}.