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/2021-06/2021-06-03.json

@@ -0,0 +1,43 @@
+{
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+  "arqtangeles-architecture": 7,
+  "dbssticky-data-viz": 34,
+  "drwnio-drwnio": 82,
+  "drwnio-storytelling": 17,
+  "dwelle-hearts": 4,
+  "ei-au-computers": 53,
+  "excacomp-mobile-kit": 13,
+  "excacomp-web-kit": 24,
+  "franky47-apple-devices-frames": 6,
+  "g-script-android": 5,
+  "g-script-charts": 9,
+  "g-script-forms": 74,
+  "g-script-medias": 5,
+  "h7y-dropdowns": 13,
+  "husainkhambaty-aws-simple-icons": 28,
+  "inwardmovement-information-architecture": 48,
+  "jakubpawlina-graphs": 14,
+  "jhoughes-veeam": 15,
+  "kaligule-robots": 17,
+  "lipis-polygons": 9,
+  "lipis-stars": 4,
+  "madhusuthanan-b-front-end-tech-and-tools": 7,
+  "madhusuthanan-b-html-css-js-icons": 3,
+  "maeddes-technology-logos": 33,
+  "marcottebear-raspberrypi-zero": 3,
+  "michelcaradec-cloud-design-patterns": 102,
+  "mikhailredis-redis-grafana": 4,
+  "morgemoensch-gadgets": 7,
+  "newbyca-cryptocurrencies": 3,
+  "ocapraro-bubbles": 22,
+  "pclainchard-it-logos": 20,
+  "revolunet-raspberrypi3": 3,
+  "rkjc-arduino-boards": 4,
+  "rkjc-schematic-symbols": 7,
+  "shinkim-presentation-templates": 9,
+  "simalexan-wardley-maps-symbols": 10,
+  "slobodan-aws-serverless": 19,
+  "spfr-lo-fi-wireframing-kit": 37,
+  "youritjang-software-architecture": 183,
+  "youritjang-stick-figures": 93
+}