fix: deployment in subpath by setting BASE_URL

[srijitcoder]

Implemented changes

• Introduced globalThis.basePath inside config.js to control the base path of git clerk so that it can easily be worked on any root level from / to /some-path/

Example to set globalThis.basePath in config.js -

globalThis.basePath = "/";

globalThis.basePath = "/git-clerk/";

globalThis.basePath = "/some-path/one/two/";