fix: remove deprecated Dockerfile language configuration and update language matching documentation

Author: MR-Addict

docs/book.toml

@@ -60,16 +60,6 @@ giscus.theme = "book"
 giscus.lang = "en"
 giscus.loading = "lazy"
 
-include.languages.dockerfile.extensions = [".dockerfile"]
-include.languages.dockerfile.filenames = [
-  "Dockerfile",
-  "dockerfile",
-  "Containerfile",
-  "Dockerfile.*",
-  "dockerfile.*",
-  "*.dockerfile",
-]
-
 custom-templates-folder = "assets/templates"
 
 # This is for the development environment

docs/src/development/language-matching.md

@@ -36,11 +36,12 @@ Example `book.toml` configuration:
 [preprocessor.embedify]
 # Add .dockerfile extension to dockerfile language
 include.languages.dockerfile.extensions = [".dockerfile"]
-# Add specific filenames to dockerfile language
+# Add specific filenames to dockerfile language(Optional)
 include.languages.dockerfile.filenames = ["Dockerfile", "*.dockerfile"]
 
 # Add a completely new language
 include.languages.mylang.extensions = [".mlg"]
+include.languages.mylang.filenames = ["MyLangFile", "MyLangFile.*"]
 ```
 
 ### Language Definition Structure