Add LDoc config file to exclude payload.lua

There is currently a bug with `file` in LDoc, where LDoc will only recognise the `file` if the directory arg is `.`
lunarmodules/ldoc#351

This means cd'ing into `./src` is required to exclude files.

.github/workflows/publish.yml

@@ -55,13 +55,14 @@ jobs:
         run: |
           wget https://github.com/lunarmodules/LDoc/archive/refs/tags/1.4.6.tar.gz &&
           tar xf 1.4.6.tar.gz &&
-          lua ./LDoc-1.4.6/ldoc.lua ./src/
+          cd ./src/
+          lua ./LDoc-1.4.6/ldoc.lua .
 
       - name: Deploy to GitHub Pages
         uses: peaceiris/actions-gh-pages@v3
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
-          publish_dir: ./doc/
+          publish_dir: ./src/doc/
 
   publish:
     needs: "version_check"

src/config.ld

@@ -0,0 +1,15 @@
+title = "Tracker for Lua"
+project = "Snowplow event tracker for Lua"
+
+description = [[
+With SnowplowTracker you can collect event data from your
+     Lua-based applications, Lua web servers/frameworks, or
+     from the Lua scripting layer within your games or apps.
+]]
+
+file = {
+    "snowplow",
+    exclude = {
+        "snowplow/payload.lua"
+    }
+}