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/2021-08/2021-08-17.json

@@ -0,0 +1,62 @@
+{
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+  "cloud-cloud": 68,
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+  "drwnio-storytelling": 17,
+  "dwelle-hearts": 4,
+  "ei-au-computers": 27,
+  "excacomp-mobile-kit": 11,
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+  "farisology-data-science": 6,
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+  "ferminrp-awesome-slides": 8,
+  "ferminrp-gantt": 11,
+  "ferminrp-post-it": 13,
+  "franky47-apple-devices-frames": 9,
+  "g-script-android": 7,
+  "g-script-charts": 9,
+  "g-script-forms": 61,
+  "g-script-medias": 11,
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+  "lipis-polygons": 5,
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+}