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/2021-07/2021-07-19.json

@@ -0,0 +1,52 @@
+{
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+  "arqtangeles-architecture": 9,
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+  "cloud-cloud": 64,
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+  "drwnio-drwnio": 47,
+  "drwnio-storytelling": 19,
+  "dwelle-hearts": 2,
+  "ei-au-computers": 26,
+  "excacomp-mobile-kit": 9,
+  "excacomp-web-kit": 17,
+  "farisology-data-science": 7,
+  "ferminrp-gantt": 18,
+  "ferminrp-post-it": 17,
+  "franky47-apple-devices-frames": 2,
+  "g-script-android": 1,
+  "g-script-charts": 11,
+  "g-script-forms": 41,
+  "g-script-medias": 1,
+  "h7y-dropdowns": 12,
+  "husainkhambaty-aws-simple-icons": 7,
+  "inwardmovement-information-architecture": 18,
+  "jakubpawlina-graphs": 4,
+  "jhoughes-veeam": 1,
+  "kaligule-robots": 3,
+  "lipis-polygons": 3,
+  "lipis-stars": 2,
+  "madhusuthanan-b-front-end-tech-and-tools": 1,
+  "maeddes-technology-logos": 22,
+  "michelcaradec-cloud-design-patterns": 34,
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+}