fix categories on two posts

src/posts/2023/2023-09-30-ecommerce-options.md

@@ -3,6 +3,8 @@ title: ecommerce options
 image:
   src: 2023/loon.jpg
   alt: "Image unrelated to post. A loon rearing up with eir wings spread on a calm lake."
+tags:
+  - reference
 ---
 
 ## [Artisans Cooperative](https://artisans.coop/pages/seller-profile/riverside-refuge-studio){target="_blank" rel="external"}

src/posts/2023/2023-10-08-leatherworking.md

@@ -4,6 +4,7 @@ image:
   src: 2023/leather-harness-wip.jpg
   alt: "two pieces of a chest harness sitting on a messy workbench. both pieces are about 8 inches long total and consist of two large o-rings joined by a dark teal leather strap. the o rings and rivets are matte black."
 tags:
+  - reference
   - leather
 ---