Merge branch 'eread/refactor-vale-config-structure' into 'master'

Restructure Vale configuration

See merge request gitlab-org/gitlab!27378

.vale.ini

-# Vale configuration file, taken from https://errata-ai.github.io/vale/config/
+# Vale configuration file.
+#
+# For more information, see https://errata-ai.gitbook.io/vale/getting-started/configuration.
 
-# The relative path to the folder containing linting rules (styles)
-# -----------------------------------------------------------------
-StylesPath = doc/.linting/vale/styles
-
-# Minimum alert level
-# -------------------
-# The minimum alert level to display (suggestion, warning, or error).
-# If integrated into CI, builds fail by default on error-level alerts,
-# unless you execute Vale with the --no-exit flag
+StylesPath = doc/.vale
 MinAlertLevel = suggestion
 
-# Should Vale parse any file formats other than .md files as Markdown?
-# --------------------------------------------------------------------
-[formats]
-mdx = md
-
-# What file types should Vale test?
-# ----------------------------------
 [*.md]
-
-# Styles to load
-# --------------
-# What styles, located in the StylesPath folder, should Vale load?
-# Vale also currently includes write-good, proselint, joblint, and vale
 BasedOnStyles = gitlab
-
-# Enabling or disabling specific rules in a style
-# -----------------------------------------------
-# To disable a rule in an enabled style, use the following format:
-# {style}.{filename} = NO
-# To enable a single rule in a disabled style, use the following format:
-# vale.Editorializing = YES
-
-# Altering the severity of a rule in a style
-# ------------------------------------------
-# To change the reporting level (suggestion, warning, error) of a rule,
-# use the following format: {style}.{filename} = {level}
-# vale.Hedging = error