Merge branch 'develop' into pr/MikeJeffers/4416

* develop: (45 commits)
  Add nextra to cSpell
  Update docs: Added Nextra to Blogs category on integrations page
  Render empty lines correctly
  Restore classes on edges for elk
  Update diagram proposal
  Update docs
  Added CKEditor and GitHub Writer to available integrations.
  Fix exceptions for empty lines
  chore(deps): update all patch dependencies
  build(deps): fix broken pnpm-lock.yaml file
  Mermaid version 10.2.0
  Mermaid Version 10.2.0-rc.4
  Label background fix
  Test commit
  Fix for regression error in sequenceDiagrams
  Update all minor dependencies
  Update all patch dependencies
  Update docs
  Add contributors profile url
  ignore ZenUML types
  ...

cypress/integration/rendering/flowchart-elk.spec.js

@@ -684,6 +684,20 @@ A --> B
       { titleTopMargin: 0 }
     );
   });
+  it('elk: should include classes on the edges', () => {
+    renderGraph(
+      `flowchart-elk TD
+      A --> B --> C --> D
+      `,
+      {}
+    );
+    cy.get('svg').should((svg) => {
+      const edges = svg.querySelectorAll('.edges > path');
+      edges.forEach((edge) => {
+        expect(edge).to.have.class('flowchart-link');
+      });
+    });
+  });
   describe('Markdown strings flowchart-elk (#4220)', () => {
     describe('html labels', () => {
       it('With styling and classes', () => {

cypress/integration/rendering/sequencediagram.spec.js

@@ -88,6 +88,16 @@ context('Sequence diagram', () => {
       {}
     );
   });
+  it('should handle empty lines', () => {
+    imgSnapshotTest(
+      `
+      sequenceDiagram
+      Alice->>John: Hello John<br/>
+      John-->>Alice: Great<br/><br/>day!
+    `,
+      {}
+    );
+  });
   it('should handle line breaks and wrap annotations', () => {
     imgSnapshotTest(
       `

cypress/integration/rendering/zenuml.spec.js

@@ -0,0 +1,19 @@
+import { imgSnapshotTest } from '../../helpers/util.js';
+
+describe('Zen UML', () => {
+  it('Basic Zen UML diagram', () => {
+    imgSnapshotTest(
+      `
+    zenuml
+			A.method() {
+        if(x) {
+          B.method() {
+            selfCall() { return X }
+          }
+        }
+      }
+    `,
+      {}
+    );
+  });
+});