Started colour scheme work

Added a GIMP file to play around in for colour picking [Cutieguwu Website Template.xcf].
Added a CSS file to keep track of theme colours [theme.css].
Adjusted current theme colours according to current mock theme.
Adjusted some class wording and heading choices in home.html and style.css

home.html

@@ -8,7 +8,7 @@
         <title>Cutieguwu - Home</title>
         <link rel="stylesheet" type="text/css" href="./Global_Resources/style.css">
         <img class="titleimg" src="">
-        <h3 class="subtitle">Welcome to my official site! Explore my projects!</p>
+        <h1 class="title">Welcome to my official site! Explore my projects!</h1>
         <nav>
             <div class="menubar">
                 <ul>
@@ -57,7 +57,7 @@
                 <div class="main-page-content" id="News1">
                     <p>I've started actual work on the website!</p>
                 </div>
-                <div class="global-page-subtitle">
+                <div class="main-page-subtitle">
                     <p>Website managed by Olive [Cutieguwu]</p>
                 </div>
                 <hr>