Remove direct @svgr/webpack v5 dependency

with sole use of @svgr/webpack 6.2.1.

docusaurus v2.0.0-beta.10 upgraded @svgr/webpack to 6
facebook/docusaurus#5958

to partially address CVE-2021-3803 by removing nth-check 1.0.2
by removing css-select 2.1.0.

Signed-off-by: Takuya Noguchi <takninnovationresearch@gmail.com>

package.json

@@ -19,7 +19,6 @@
     "@docusaurus/preset-classic": "^2.0.0-beta.18",
     "@mdx-js/react": "^1.6.21",
     "@stoplight/spectral-cli": "^6.3.0",
-    "@svgr/webpack": "^5.5.0",
     "clsx": "^1.1.1",
     "docusaurus2-dotenv": "^1.4.0",
     "file-loader": "^6.2.0",