docs: align API reference package name with PyPI (#940)

The package name is rendered as the label on the docs website API
reference pages, so this renames it (`apify-sdk-python-website` / older
`apify-sdk-python`) to `apify` (the PyPI package), across all versions.

@B4nan tagging you as a reviewer since you changed this recently — let
me know if there was any reasoning behind it that I'm missing.

Author: vdusek

website/package.json

@@ -1,5 +1,5 @@
 {
-    "name": "apify-sdk-python-website",
+    "name": "apify",
     "private": true,
     "scripts": {
         "clean": "rimraf .docusaurus build",

website/versioned_docs/version-0.2/api-packages.json

@@ -1 +1 @@
-[{"entryPoints":{"index":{"label":"Index","path":"src/index.ts"}},"packageRoot":".","packagePath":".","packageSlug":".","packageName":"apify-sdk-python"}]
+[{"entryPoints":{"index":{"label":"Index","path":"src/index.ts"}},"packageRoot":".","packagePath":".","packageSlug":".","packageName":"apify"}]

website/versioned_docs/version-1.7/api-packages.json

@@ -1 +1 @@
-[{"entryPoints":{"index":{"label":"Index","path":"src/index.ts"}},"packageRoot":".","packagePath":".","packageSlug":".","packageName":"apify-sdk-python"}]
+[{"entryPoints":{"index":{"label":"Index","path":"src/index.ts"}},"packageRoot":".","packagePath":".","packageSlug":".","packageName":"apify"}]

website/versioned_docs/version-2.7/api-packages.json

@@ -1 +1 @@
-[{"entryPoints":{"index":{"label":"Index","path":"src/index.ts"}},"packageRoot":".","packagePath":".","packageSlug":".","packageName":"apify-sdk-python"}]
+[{"entryPoints":{"index":{"label":"Index","path":"src/index.ts"}},"packageRoot":".","packagePath":".","packageSlug":".","packageName":"apify"}]

website/versioned_docs/version-3.4/api-packages.json

@@ -1 +1 @@
-[{"entryPoints":{"index":{"label":"Index","path":"src/index.ts"}},"packageRoot":".","packagePath":".","packageSlug":".","packageName":"apify-sdk-python-website"}]
+[{"entryPoints":{"index":{"label":"Index","path":"src/index.ts"}},"packageRoot":".","packagePath":".","packageSlug":".","packageName":"apify"}]