Rename jekyll's docker file

Since this is no longer a Jekyll-only site I decided to rename the Dockerfile used for the Jekyll site to Dockerfile.jekyll to be consistent with the Gemini Dockerfile (Dockerfile.gemini).

Gemfile.lock

@@ -3,7 +3,7 @@ GEM
   specs:
     addressable (2.8.7)
       public_suffix (>= 2.0.2, < 7.0)
-    bigdecimal (3.1.8)
+    bigdecimal (3.1.9)
     colorator (1.1.0)
     commonmarker (0.23.11)
     concurrent-ruby (1.3.4)
@@ -81,4 +81,4 @@ DEPENDENCIES
   jekyll-feed (~> 0.12)
 
 BUNDLED WITH
-   2.6.1
+   2.6.2

compose.yaml

@@ -1,12 +1,16 @@
 services:
+
   jekyll:
-    build: .
+    build:
+      context: .
+      dockerfile: Dockerfile.jekyll
     platform: linux/amd64
     ports:
       - 4000:4000
       - 35729:35729
     volumes:
       - .:/app
+
   gemini:
     build:
       context: .