Merge branch 'develop' into next

* develop: (50 commits)
  Use pixelmatch for image comparison
  Run all tests
  Fix lint
  Update lockfile
  E2E test
  Use cache to store snapshots
  chore(deps): update all patch dependencies
  Change string concatenation to template literal
  Revert "Revert 5041 feature/4935 subgraph title margin config option"
  build(deps-dev): bump follow-redirects from 1.15.2 to 1.15.5
  Run dev docs without npx
  Remove npx completely from run script
  Update docs
  Fix linters
  Removed volta requirement, leave pnpm only
  Fixed dead link
  build
  Update docs
  Updated contributing docs after review, minor fixes
  Updated gantt chart docs to show all config options
  ...

cypress/integration/other/configuration.spec.js

@@ -117,7 +117,6 @@ describe('Configuration', () => {
     });
     it('should not taint the initial configuration when using multiple directives', () => {
       const url = 'http://localhost:9000/regression/issue-1874.html';
-      cy.viewport(1440, 1024);
       cy.visit(url);
 
       cy.get('svg');

cypress/integration/other/rerender.spec.js

@@ -1,14 +1,12 @@
 describe('Rerendering', () => {
   it('should be able to render after an error has occurred', () => {
     const url = 'http://localhost:9000/render-after-error.html';
-    cy.viewport(1440, 1024);
     cy.visit(url);
     cy.get('#graphDiv').should('exist');
   });
 
   it('should be able to render and rerender a graph via API', () => {
     const url = 'http://localhost:9000/rerender.html';
-    cy.viewport(1440, 1024);
     cy.visit(url);
     cy.get('#graph [id^=flowchart-A]').should('have.text', 'XMas');