Add website update GitHub action

.github/linters/.mega-linter.yml

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+# Configuration file for MegaLinter
+# See all available variables at https://megalinter.io/configuration/ and in linters documentation
+# ADD YOUR CUSTOM ENV VARIABLES HERE OR DEFINE THEM IN A FILE .mega-linter.yml AT THE ROOT OF YOUR REPOSITORY
+ENABLE_LINTERS:
+  - PYTHON_BLACK
+  - PYTHON_RUFF
+  - CSS_STYLELINT
+  - HTML_HTMLHINT
+  - MARKDOWN_MARKDOWNLINT
+  - YAML_PRETTIER
+MARKDOWN_FILTER_REGEX_EXCLUDE: '(LICENSE\.md|docs/NEWS\.md)'
+MARKDOWN_MARKDOWN_LINK_CHECK_DISABLE_ERRORS: true
+PRE_COMMANDS:
+  - command: R --slave -e 'install.packages(c("lintr"))'
+    cwd: "root"
+PRINT_ALL_FILES: false