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/2021-12/2021-12-04.json

@@ -0,0 +1,60 @@
+{
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+  "bjoernkw-uml-er-library": 8,
+  "claracavalcante-baby-characters": 7,
+  "cloud-cloud": 15,
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+  "drwnio-storytelling": 17,
+  "dwelle-hearts": 2,
+  "dwelle-network-topology-icons": 52,
+  "ei-au-computers": 5,
+  "esteevens-logos": 2,
+  "excacomp-mobile-kit": 2,
+  "excacomp-web-kit": 5,
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+  "ferminrp-gantt": 1,
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+  "g-script-medias": 4,
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+  "youritjang-stick-figures": 28
+}