Remove all legacy preparer code and dependencies.

Signed-off-by: Eric Peterson <ericpeterson@spotify.com>

packages/techdocs-common/package.json

@@ -46,10 +46,8 @@
     "@google-cloud/storage": "^5.6.0",
     "@types/express": "^4.17.6",
     "aws-sdk": "^2.840.0",
-    "cross-fetch": "^3.0.6",
     "express": "^4.17.1",
     "fs-extra": "9.1.0",
-    "git-url-parse": "~11.4.4",
     "js-yaml": "^4.0.0",
     "json5": "^2.1.3",
     "mime-types": "^2.1.27",
@@ -62,7 +60,6 @@
   "devDependencies": {
     "@backstage/cli": "^0.7.5",
     "@types/fs-extra": "^9.0.5",
-    "@types/git-url-parse": "^9.0.0",
     "@types/js-yaml": "^4.0.0",
     "@types/mime-types": "^2.1.0",
     "@types/mock-fs": "^4.13.0",