chore: Rework the makefile, with lots of comments (#371)

Author: elliottt

.github/workflows/main.yml

@@ -80,7 +80,7 @@ jobs:
       if: ${{ !startsWith(github.ref, 'refs/tags/v') }}
 
     - name: "Build JS runtime (debug)"
-      run: DEBUG=1 CXX_OPT="-O1" npm run build
+      run: DEBUG=1 OPT_FLAGS="-O1" npm run build
       if: matrix.profile == 'debug'
 
     - name: "Build JS runtime (release)"

c-dependencies/js-compute-runtime/.gitignore

@@ -2,10 +2,5 @@
 /compile_commands.json
 /.cache
 
-/rusturl
-/compiler_flags
 /js-compute-runtime*.wasm
-/obj
-
-*.o
-*.d
+/build