simplify sed operations

Dockerfile

@@ -10,20 +10,18 @@ COPY . .
 # Hugo base url
 ARG HUGO_BASEURL="https://tvhsfrc.org"
 
-RUN HUGO_BASEURL=$HUGO_BASEURL hugo --environment production
-
-RUN find public -type f -name "*.html" -exec sed -i "s|src=.*/img/dragons.png|src=\"/img/dragons.png|g" {} \;
-RUN find public -type f -name "*.html" -exec sed -i "s|src=.*/img/logo.png|src=\"/img/logo.png|g" {} \;
-RUN find public -type f -name "*.html" -exec sed -i "s|class=\"logo-link\" href=\".*\"|class=\"logo-link\" href=\"$HUGO_BASEURL\"|g" {} \;
-RUN find public -type f -name "*.html" -exec sed -i "s|href=.*/support|href=\"$HUGO_BASEURL/support|g" {} \;
-
-RUN find public -type f -name "*.html" -exec sed -i "s|src=\"/img|src=\"$HUGO_BASEURL/img|g" {} \;
-RUN find public -type f -name "*.html" -exec sed -i "s|href=\"/css|href=\"$HUGO_BASEURL/css|g" {} \;
-RUN find public -type f -name "*.html" -exec sed -i "s|src=\"/js|src=\"$HUGO_BASEURL/js|g" {} \;
-RUN find public -type f -name "*.html" -exec sed -i "s|href=\"/fonts|href=\"$HUGO_BASEURL/fonts|g" {} \;
-
-RUN find public -type f -name "*.css" -exec sed -i "s|url(/img|url($HUGO_BASEURL/img|g" {} \;
-RUN find public -type f -name "*.css" -exec sed -i "s|url(/fonts|url($HUGO_BASEURL/fonts|g" {} \;
+RUN hugo --environment production
+
+# Remove BaseURL from all hrefs, srcs, and urls. Making the site uniformly relative.
+RUN find public -type f -name "*.html" -exec sed -i "s|$HUGO_BASEURL||g" {} \;
+# Remove the BaseURL path from all hrefs, srcs, and urls. Making the site uniformly relative.
+RUN BASEPATH=$(echo "$HUGO_BASEURL" | sed 's|https://[^/]*||') && \
+    find public -type f -name "*.html" -exec sed -i "s|$BASEPATH||g" {} \;
+
+# Add back the BaseURL to all hrefs, srcs, and urls
+RUN find public -type f -name "*.html" -exec sed -i "s|href=\"/|href=\"$HUGO_BASEURL/|g" {} \;
+RUN find public -type f -name "*.html" -exec sed -i "s|src=\"/|src=\"$HUGO_BASEURL/|g" {} \;
+RUN find public -type f -name "*.html" -exec sed -i "s|url(/|url($HUGO_BASEURL/|g" {} \;
 
 FROM nginx:alpine