Improve header navigation

Author: gomzyakov

src/Templates/main.html

@@ -57,16 +57,42 @@ <h1 class="h5 text-uppercase fw-bold mt-2">Good First Issue</h1>
     <!-- Select programming language -->
     <div class="row my-4">
         <div class="col-12">
-            <a target="_blank" href="index.html" class="btn btn-sm btn-outline-secondary me-2" type="button">
+            <a href="./index.html" class="btn btn-sm btn-outline-secondary me-2" type="button">
                 PHP
             </a>
-            <a target="_blank" href="./lang/Python.html" class="btn btn-sm btn-outline-secondary me-2" type="button">
+            <a href="./lang/Python.html" class="btn btn-sm btn-outline-secondary me-2" type="button">
                 Python
             </a>
-            <a target="_blank" href="./lang/TypeScript.html" class="btn btn-sm btn-outline-secondary me-2" type="button">
+            <a href="./lang/JavaScript.html" class="btn btn-sm btn-outline-secondary me-2" type="button">
+                JavaScript
+            </a>
+            <a href="./lang/Java.html" class="btn btn-sm btn-outline-secondary me-2" type="button">
+                Java
+            </a>
+            <a href="./lang/HTML.html" class="btn btn-sm btn-outline-secondary me-2" type="button">
+                HTML
+            </a>
+            <a href="./lang/JupyterNotebook.html" class="btn btn-sm btn-outline-secondary me-2" type="button">
+                JupyterNotebook
+            </a>
+            <a href="./lang/TypeScript.html" class="btn btn-sm btn-outline-secondary me-2" type="button">
                 TypeScript
             </a>
-
+            <a href="./lang/CSharp.html" class="btn btn-sm btn-outline-secondary me-2" type="button">
+                CSharp
+            </a>
+            <a href="./lang/CPlusPlus.html" class="btn btn-sm btn-outline-secondary me-2" type="button">
+                CPlusPlus
+            </a>
+            <a href="./lang/CSS.html" class="btn btn-sm btn-outline-secondary me-2" type="button">
+                CSS
+            </a>
+            <a href="./lang/Go.html" class="btn btn-sm btn-outline-secondary me-2" type="button">
+                Go
+            </a>
+            <a href="./lang/Ruby.html" class="btn btn-sm btn-outline-secondary me-2" type="button">
+                Ruby
+            </a>
         </div>
     </div>
     <!-- / Select programming language -->