chore: migrate issue and PR templates to Gitea format

Also add metadata to the issues and the PR template.

GitLab doesn't use file-based configuration for the PR template,
so the template is added here.

See https://docs.gitea.io/en-us/issue-pull-request-templates/

.gitea/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,15 @@
+# Description
+
+Please write down a clear and concise description of this Merge Request.
+
+# Closes
+
+Please write down the issues that this MR closes.
+
+# Implementation Insight
+
+Please write down how did you implement this in a clear and concise manner.
+
+# TO-DOs
+
+A list of TO-DOs of things you have did before the MR is undrafted.

.gitea/issue_templates/Bug.md

@@ -1,3 +1,15 @@
+---
+
+name: Bug Report
+about: Report a bug affecting Echidna Code Editor
+title: bug: 
+ref: main
+labels:
+
+- bug
+- help needed
+---
+
 ## Description
 
 Please write a clear and concise description of the issue you are getting.

.gitea/issue_templates/Feature Request.md

@@ -1,3 +1,15 @@
+---
+
+name: Feature Request
+about: Request a new feature or support that can be implemented into Echidna.
+title: "feat: "
+ref: main
+labels:
+
+- enhancement
+
+---
+
 ## Description
 
 Please write a clear and concise description of the issue you are getting.

src/components/window/file.rs

@@ -14,6 +14,7 @@ pub trait FileImplementedEditor {
     fn action_open_file(&self);
     fn open_file(notebook: &gtk::Notebook, file: gio::File);
     fn action_save_file_as(&self);
+    fn action_new_file(&self);
     fn action_save_file(&self);
 }
 
@@ -102,6 +103,14 @@ impl FileImplementedEditor for super::EchidnaWindow {
             }));
     }
 
+    fn action_new_file(&self) {
+        let editor_page = EchidnaCoreEditor::new(None);
+
+        self.to_imp()
+            .notebook
+            .prepend_closable_page(&editor_page, Some(&gtk::Label::new(Some(&"Untitled"))));
+    }
+
     fn action_save_file(&self) {
         let page: EchidnaCoreEditor = self
             .get_current_tab()

src/components/window/menubar.rs

@@ -122,6 +122,16 @@ impl MenubarImplementedEditor for EchidnaWindow {
                     window.action_save_file_as();
             }));
         }
+        {
+            let action_new_file = SimpleAction::new("new-file", None);
+
+            self.add_action(&action_new_file);
+
+            action_new_file.connect_activate(clone!(@weak self as window =>
+                move |_action, _variant| {
+                    window.action_new_file();
+            }));
+        }
         {
             let action_save = SimpleAction::new("save", None);