Rename avifs with webp

Related: #17

Writerside/topics/recipes/sweet-potato-w-picadillo.md

@@ -3,7 +3,7 @@
 Picadillo is ground meat, tomatoes/tomato sauce, raisins/a general dried fruit, and olives. See also its [Wikipedia article](https://en.wikipedia.org/wiki/Picadillo).
 Being a European, I just think Picadillo like “Sauce Bolognese but with dried fruits and olives.”
 
-![The plated, finished dish: the meat sauce filled in half a sweet potato](./photos/sweet-potato-w-picadillo-plated.avif)
+![The plated, finished dish: the meat sauce filled in half a sweet potato](./photos/sweet-potato-w-picadillo-plated.webp)
 
 ## Ingredients
 
@@ -21,18 +21,18 @@ Being a European, I just think Picadillo like “Sauce Bolognese but with dried
 * kosher salt
 * chopped fresh cilantro, some leaves for decoration
 
-![The chopped and measured ingredients arranged on a cutting board](./photos/sweet-potato-w-picadillo-prepped-ingredients.avif)
+![The chopped and measured ingredients arranged on a cutting board](./photos/sweet-potato-w-picadillo-prepped-ingredients.webp)
 
 ## Directions
 
 1. Preheat oven to 220 °C
 2. Cut sweet potatoes in half, pierce inside with a fork, spread olive oil and salt on inside
-   ![Four halved potatoes with oil and salt, arranged on a cutting board](./photos/sweet-potato-w-picadillo-potatoes.avif)
+   ![Four halved potatoes with oil and salt, arranged on a cutting board](./photos/sweet-potato-w-picadillo-potatoes.webp)
 3. Put in the microwave for 5′ (saves oven time), then into the oven
 4. In a pan, cook onion until translucent
 5. Add garlic, cumin, cinnamon; let flavors come together a bit
 6. Add beef, cook through
 7. Add tomatoes, the dried fruits, olives, capers; let simmer.
 8. Add cilantro, salt to taste
 9. From the baked potatoes, make a hole, add beef, put into the oven again until finished.
-   ![Filled potatoes in an oven pan](./photos/sweet-potato-w-picadillo-baked.avif)
+   ![Filled potatoes in an oven pan](./photos/sweet-potato-w-picadillo-baked.webp)