fix: convert cf-kv and excalidraw-libraries from submodules to regular files

- Remove stale cloudflare-worker submodule entry from .gitmodules
- Remove .git dirs from cf-kv and excalidraw-libraries so Git tracks them as regular files
- Fixes 'No url found for submodule path cf-kv' CI error

excalidraw-libraries/stats/2021-10/2021-10-08.json

@@ -0,0 +1,71 @@
+{
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+  "cloud-cloud": 52,
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+  "excacomp-mobile-kit": 14,
+  "excacomp-web-kit": 31,
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+}