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/2021-07/2021-07-29.json

@@ -0,0 +1,57 @@
+{
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+  "arqtangeles-architecture": 2,
+  "braweria-customer-journey-map": 1,
+  "cloud-cloud": 95,
+  "dbssticky-data-viz": 32,
+  "drwnio-drwnio": 70,
+  "drwnio-storytelling": 19,
+  "dwelle-hearts": 4,
+  "ei-au-computers": 25,
+  "excacomp-mobile-kit": 1,
+  "excacomp-web-kit": 11,
+  "farisology-data-science": 8,
+  "ferminrp-awesome-slides": 12,
+  "ferminrp-gantt": 20,
+  "ferminrp-post-it": 16,
+  "franky47-apple-devices-frames": 1,
+  "g-script-android": 4,
+  "g-script-charts": 10,
+  "g-script-forms": 48,
+  "g-script-medias": 6,
+  "h7y-dropdowns": 7,
+  "husainkhambaty-aws-simple-icons": 15,
+  "inwardmovement-information-architecture": 26,
+  "jakubpawlina-graphs": 5,
+  "jhoughes-veeam": 7,
+  "kaligule-robots": 12,
+  "lipis-polygons": 3,
+  "lipis-stars": 2,
+  "madhusuthanan-b-front-end-tech-and-tools": 6,
+  "madhusuthanan-b-html-css-js-icons": 1,
+  "maeddes-technology-logos": 36,
+  "marcottebear-raspberrypi-zero": 1,
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+  "morgemoensch-gadgets": 7,
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+  "youritjang-azure-cloud-services": 6,
+  "youritjang-software-architecture": 180,
+  "youritjang-stick-figures": 66
+}