Removed unused snapshot files

- the tests that used these files have been moved to test/e2e-api

test/regression/api/admin/__snapshots__/site.test.js.snap

@@ -1,27 +0,0 @@
-// Jest Snapshot v1, https://goo.gl/fbAQLP
-
-exports[`Site API can retrieve config and all expected properties 1: [body] 1`] = `
-Object {
-  "site": Object {
-    "accent_color": "#FF1A75",
-    "description": "Thoughts, stories and ideas",
-    "icon": null,
-    "logo": null,
-    "title": "Ghost",
-    "url": "http://127.0.0.1:2369/",
-    "version": StringMatching /\\\\d\\+\\\\\\.\\\\d\\+/,
-  },
-}
-`;
-
-exports[`Site API can retrieve config and all expected properties 2: [headers] 1`] = `
-Object {
-  "access-control-allow-origin": "http://127.0.0.1:2369",
-  "cache-control": "no-cache, private, no-store, must-revalidate, max-stale=0, post-check=0, pre-check=0",
-  "content-length": "167",
-  "content-type": "application/json; charset=utf-8",
-  "etag": Any<String>,
-  "vary": "Origin, Accept-Encoding",
-  "x-powered-by": "Express",
-}
-`;