docs: integrate Vale for documentation linting (#2242)

* added value rules

* resolved errors raised by vale

* added github action

* fixes to github action

* added details in contribution guidelines

* added rule for numbers

* limited checks to errors

.vale.ini

@@ -0,0 +1,17 @@
+StylesPath = docs/styles
+
+MinAlertLevel = suggestion
+Vocab = Base
+
+Packages = write-good
+
+[*.{md,mdx}]
+BasedOnStyles = Vale, write-good, docs
+Vale.Spelling=warning
+write-good.E-Prime=No
+write-good.So=No
+write-good.ThereIs=No
+Vale.Terms=No
+
+[formats]
+mdx = md