Meta: Add icons to online man pages

Previously all the added icons weren't available in the online version
of the man pages. This patch adds functionality to copy all the used
icons over when assembling the HTML version.

Meta/build-manpages-website.sh

@@ -105,3 +105,12 @@ pandoc -f gfm -t html5 -s \
 
 # Copy pre-made files
 cp Meta/Websites/man.serenityos.org/banner.png output/
+
+# Copy icons
+mkdir output/icons
+
+while read -r p; do
+  rsync -a --relative Base/res/icons/./"$p" output/icons/
+done < icons.txt
+
+rm icons.txt

Meta/convert-markdown-links.lua

@@ -3,3 +3,14 @@ function Link(el)
     el.target = string.gsub(el.target, "help://man/([^/]*)/(.*)", "../man%1/%2.html")
     return el
 end
+
+function Image(el)
+    local pattern = "/res/icons/(.*)"
+    local image = string.gsub(el.src, pattern, "%1")
+
+    el.src = "../icons/" .. image
+    file = io.open("icons.txt", "a+")
+    file:write(image .. "\n")
+    file:close()
+    return el
+end