Docs fixes

- fix error if _data dir exists
- add _data dir to cleaning
- add some more to widget creation doc

doc/etemplate2/eleventy.config.cjs

@@ -25,7 +25,10 @@ const allComponents = getAllComponents();
 let hasBuiltSearchIndex = false;
 
 // Write component data to file, 11ty will pick it up and create pages - the name & location are important
-fs.mkdirSync("_data");
+if (!fs.existsSync("_data"))
+{
+	fs.mkdirSync("_data");
+}
 fs.writeFileSync("_data/components.json", JSON.stringify(allComponents));
 
 // Put it here too, since addPassthroughCopy() ignores it

doc/etemplate2/pages/tutorials/creating-a-widget.md

@@ -24,16 +24,22 @@ in `test/`.
 ### Get it loaded
 
 To have EGroupware load your component, it must be included somewhere.
-Add your component to the `include` block at the top of `/api/js/etemplate/etemplate2.js`. If you have an application
+Add your component to the `import` block at the top of `/api/js/etemplate/etemplate2.js`. If you have an application
 specific component, include at the top of your `app.js`.
 
 ```typescript
 ...
 import './MyWidget/MyWidget.ts';
-
 ...
 ```
 
 ### Load and return
 
+Components do not need to have a value, but if they do you need to extend Et2InputWidget instead of just Et2Widget.
+We use `set_value()` the _initial_ load from the template. When the etemplate is submitted, we'll
+return `widget.getValue()`.  
+`widget.value` is the normal way to access the widget's value programmatically, the other methods add some additional
+checking.  
+If the widget is readonly or disabled, it won't return value and `widget.value` is not called when submitting.
+
 ### AJAX data

doc/scripts/build.mjs

@@ -26,7 +26,7 @@ const execPromise = util.promisify(exec);
 let childProcess;
 let buildResults;
 
-const bundleDirectories = [outdir];
+const bundleDirectories = [outdir, 'doc/etemplate2/_data'];
 let packageData = JSON.parse(readFileSync(path.join(process.cwd(), 'package.json'), 'utf-8'));
 const egwVersion = JSON.stringify(packageData.version.toString());