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

docs/styles/docs/Terms.yml

@@ -0,0 +1,8 @@
+extends: substitution
+message: Consider using '%s' instead of '%s'
+level: warning
+scope: code
+ignorecase: false
+# swap maps tokens in form of bad: good
+swap:
+  e-commerce: ecommerce