docs: add editPageLink in demo

docs/demo/src/content/tutorial/1-forms-css/1-introduction/1-welcome/content.md

@@ -3,6 +3,7 @@ type: lesson
 title: Style up your forms!
 slug: welcome
 focus: /welcome.css
+editPageLink: https://github.com/stackblitz/tutorialkit/blob/main/docs/demo/src/content/tutorial/1-forms-css/1-introduction/1-welcome/content.md?plain=1 
 ---
 
 :::info{noBorder=true title="Welcome!"}

docs/demo/src/content/tutorial/1-forms-css/2-colors/1-accent-color/content.md

@@ -3,6 +3,7 @@ type: lesson
 title: Accent Color
 focus: /style.css
 slug: accent-color
+editPageLink: https://github.com/stackblitz/tutorialkit/blob/main/docs/demo/src/content/tutorial/1-forms-css/2-colors/1-accent-color/content.md?plain=1  
 ---
 
 ## Customize the input colors

docs/demo/src/content/tutorial/1-forms-css/2-colors/2-progressbar/content.md

@@ -4,6 +4,7 @@ title: Progress bar
 slug: progress-bar
 focus: /style.css
 template: default
+editPageLink: https://github.com/stackblitz/tutorialkit/blob/main/docs/demo/src/content/tutorial/1-forms-css/2-colors/2-progressbar/content.md?plain=1 
 ---
 
 ## Styling the `<progress>`

docs/demo/src/content/tutorial/1-forms-css/2-colors/3-more-progressbar/content.md

@@ -4,6 +4,7 @@ title: More Progress bar
 slug: more-progress-bar
 focus: /style.css
 template: default
+editPageLink: https://github.com/stackblitz/tutorialkit/blob/main/docs/demo/src/content/tutorial/1-forms-css/2-colors/3-more-progressbar/content.md?plain=1
 ---
 
 ## Styling the `<progress>`

docs/demo/src/content/tutorial/1-forms-css/2-colors/4-handle-firefox/content.md

@@ -4,6 +4,7 @@ title: Handle Firefox
 slug: handle-firefox
 focus: /style.css
 template: default
+editPageLink: https://github.com/stackblitz/tutorialkit/blob/main/docs/demo/src/content/tutorial/1-forms-css/2-colors/4-handle-firefox/content.md?plain=1
 ---
 
 ## What about Firefox?

docs/demo/src/content/tutorial/1-forms-css/3-fieldset/1-fieldset-element/content.md

@@ -3,6 +3,7 @@ type: lesson
 title: Fieldset element
 slug: fieldset-element
 focus: /index.html
+editPageLink: https://github.com/stackblitz/tutorialkit/blob/main/docs/demo/src/content/tutorial/1-forms-css/3-fieldset/1-fieldset-element/content.md?plain=1 
 ---
 
 The `<fieldset>` HTML element groups related form controls, such as buttons, inputs, textareas, and labels, within a web form.

docs/demo/src/content/tutorial/1-forms-css/3-fieldset/2-a-legend/content.md

@@ -3,6 +3,7 @@ type: lesson
 title: A legend
 slug: a-legend
 focus: /index.html
+editPageLink: https://github.com/stackblitz/tutorialkit/blob/main/docs/demo/src/content/tutorial/1-forms-css/3-fieldset/2-a-legend/content.md?plain=1
 ---
 
 Even with the default styling `<fieldset>` already visually separates one group of form controls from another.

docs/demo/src/content/tutorial/1-forms-css/3-fieldset/3-fieldset-styling/content.md

@@ -3,6 +3,7 @@ type: lesson
 title: Styling fieldsets
 slug: fieldset-styling
 focus: /style.css
+editPageLink: https://github.com/stackblitz/tutorialkit/blob/main/docs/demo/src/content/tutorial/1-forms-css/3-fieldset/3-fieldset-styling/content.md?plain=1
 ---
 
 Our HTML looks great, but the default styles leave a lot of room for improvements. Thankfully, the way `<fieldset>` and `<legend>` look like can be customized with a standard CSS.

docs/demo/src/content/tutorial/1-forms-css/3-fieldset/5-focus-within/content.md

@@ -3,6 +3,7 @@ type: lesson
 title: Focus within
 slug: focus-within
 focus: /style.css
+editPageLink: https://github.com/stackblitz/tutorialkit/blob/main/docs/demo/src/content/tutorial/1-forms-css/3-fieldset/5-focus-within/content.md?plain=1
 ---
 A great way to give our visitors a pointer to where they are in the form is the `:focus` state. The most common way to apply it is by highlighting the currently focused form controls like buttons and inputs. But now that the fieldset provides us with a higher level of organization for the form, we can also highlight it to give even better visual guidance!
 

docs/demo/src/content/tutorial/1-forms-css/3-fieldset/6-the-end/content.md

@@ -3,6 +3,7 @@ type: lesson
 title: The end
 slug: the-end
 focus: /style.css
+editPageLink: https://github.com/stackblitz/tutorialkit/blob/main/docs/demo/src/content/tutorial/1-forms-css/3-fieldset/6-the-end/content.md?plain=1
 ---
 You've reached the end of this tutorial! We hope you've enjoyed it and learned something new about working with CSS and forms.