chore(deps): bump postcss from 8.4.26 to 8.4.31 in /website

Bumps [postcss](https://github.com/postcss/postcss) from 8.4.26 to 8.4.31.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.26...8.4.31)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

website/yarn.lock

@@ -1528,15 +1528,6 @@
     "@types/react" "*"
     prop-types "^15.6.2"
 
-"@docusaurus/remark-plugin-npm2yarn@2.4.1":
-  version "2.4.1"
-  resolved "https://registry.yarnpkg.com/@docusaurus/remark-plugin-npm2yarn/-/remark-plugin-npm2yarn-2.4.1.tgz#c67f5bc97cc6a4adee5eec0f3e97238b674b844b"
-  integrity sha512-RTX4hGCrwibqjDVf6edWVNwdvWHjx+YmfKwxqXxfhNnYjypTCXWTAyKeIfCUW2DNdtqAI2ZM0zFhB1maua2JbQ==
-  dependencies:
-    npm-to-yarn "^2.0.0"
-    tslib "^2.4.1"
-    unist-util-visit "^2.0.3"
-
 "@docusaurus/theme-classic@2.4.1":
   version "2.4.1"
   resolved "https://registry.yarnpkg.com/@docusaurus/theme-classic/-/theme-classic-2.4.1.tgz#0060cb263c1a73a33ac33f79bb6bc2a12a56ad9e"
@@ -5321,11 +5312,6 @@ npm-run-path@^4.0.1:
   dependencies:
     path-key "^3.0.0"
 
-npm-to-yarn@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/npm-to-yarn/-/npm-to-yarn-2.0.0.tgz#59c9c615eca3ba8920308a0b418007b73ffc7492"
-  integrity sha512-/IbjiJ7vqbxfxJxAZ+QI9CCRjnIbvGxn5KQcSY9xHh0lMKc/Sgqmm7yp7KPmd6TiTZX5/KiSBKlkGHo59ucZbg==
-
 nprogress@^0.2.0:
   version "0.2.0"
   resolved "https://registry.yarnpkg.com/nprogress/-/nprogress-0.2.0.tgz#cb8f34c53213d895723fcbab907e9422adbcafb1"
@@ -5911,9 +5897,9 @@ postcss-zindex@^5.1.0:
   integrity sha512-fgFMf0OtVSBR1va1JNHYgMxYk73yhn/qb4uQDq1DLGYolz8gHCyr/sesEuGUaYs58E3ZJRcpoGuPVoB7Meiq9A==
 
 postcss@^8.3.11, postcss@^8.4.14, postcss@^8.4.17, postcss@^8.4.21:
-  version "8.4.26"
-  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.4.26.tgz#1bc62ab19f8e1e5463d98cf74af39702a00a9e94"
-  integrity sha512-jrXHFF8iTloAenySjM/ob3gSj7pCu0Ji49hnjqzsgSRa50hkWCKD0HQ+gMNJkW38jBI68MpAAg7ZWwHwX8NMMw==
+  version "8.4.31"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.4.31.tgz#92b451050a9f914da6755af352bdc0192508656d"
+  integrity sha512-PS08Iboia9mts/2ygV3eLpY5ghnUcfLV/EXTOW1E2qYxJKGGBUtNjN76FYHnMs36RmARn41bC0AZmn+rR0OVpQ==
   dependencies:
     nanoid "^3.3.6"
     picocolors "^1.0.0"
@@ -7096,7 +7082,7 @@ trough@^1.0.0:
   resolved "https://registry.yarnpkg.com/trough/-/trough-1.0.5.tgz#b8b639cefad7d0bb2abd37d433ff8293efa5f406"
   integrity sha512-rvuRbTarPXmMb79SmzEp8aqXNKcK+y0XaB298IXueQ8I2PsrATcPBCSPyK/dDNa2iWOhKlfNnOjdAOTBU/nkFA==
 
-tslib@^2.0.3, tslib@^2.1.0, tslib@^2.4.0, tslib@^2.4.1:
+tslib@^2.0.3, tslib@^2.1.0, tslib@^2.4.0:
   version "2.6.0"
   resolved "https://registry.yarnpkg.com/tslib/-/tslib-2.6.0.tgz#b295854684dbda164e181d259a22cd779dcd7bc3"
   integrity sha512-7At1WUettjcSRHXCyYtTselblcHl9PJFFVKiCAy/bY97+BPZXSQ2wbq0P9s8tK2G7dFQfNnlJnPAiArVBVBsfA==