Enhance Torn Vault Tracker: Add documentation, improve exception handling, and update styles

- Updated .gitignore to exclude new directories and files.
- Enhanced config.php with detailed PHPDoc comments for better clarity.
- Refactored functions.php to include PHPDoc comments and improve code readability.
- Added custom exceptions in exceptions.php with detailed documentation.
- Improved utilities.php with better documentation and error handling.
- Updated index.php with structured comments and improved readability.
- Refined style.css for better visual consistency.
- Introduced phpcs.xml for coding style checks and standards enforcement.

phpcs.xml

@@ -0,0 +1,29 @@
+<?xml version="1.0"?>
+<ruleset name="Coding Style Checks">
+  <description>Coding Style Checks</description>
+  <ini name="error_reporting" value="E_ALL &#38; ~E_DEPRECATED" />
+
+  <arg value="sp"/>
+  <arg name="colors"/>
+  <arg name="extensions" value="php,html,css"/>
+  <arg name="parallel" value="2048"/>
+
+  <exclude-pattern>vendor/</exclude-pattern>
+  <exclude-pattern>node_modules/</exclude-pattern>
+
+  <rule ref="PEAR">
+    <exclude name="PEAR.Classes.ClassDeclaration"/>
+    <exclude name="PEAR.Functions.FunctionDeclaration"/>
+    <exclude name="Generic.Files.LineLength.TooLong"/>
+    <exclude name="Generic.WhiteSpace.DisallowSpaceIndent.SpacesUsed"/>
+    <exclude name="Generic.Functions.CallTimePassByReference"/>
+    <exclude name="Squiz.Commenting.FileComment.MissingPackageTag"/>
+    <exclude name="Squiz.Commenting.FileComment.Missing"/>
+    <exclude name="Squiz.Commenting.FileComment.WrongStyle"/>
+    <exclude name="Squiz.Commenting.InlineComment.InvalidEndChar"/>
+  </rule>
+
+  <rule ref="Internal.NoCodeFound">
+    <severity>0</severity>
+  </rule>
+</ruleset>