renumber slides

README.md

@@ -3,8 +3,8 @@
 | # | Lecture                                          | Slides                                              |
 |:--|:-------------------------------------------------|:----------------------------------------------------|
 | 1 | [Introduction to the Web](1-web-introduction.md) | [Download slides](1-web-introduction-slides.html)   |
-| 2 | [HTTP](2-http.md)                                | [Download slides](2-http-slides.html)               |
-| 3 | [HTML basics](3-html.md)                         | [Download slides](3-html-slides.html)               |
-| 4 | [CSS](4-css.md)                                  | [Download slides](4-css-slides.html)                |
-| 5 | [Bootstrap](5-bootstrap.md)                      | [Download slides](5-bootstrap-slides.html)          |
-| 6 | [JS in HTML & DOM](6-js-in-html-and-dom.md)      | [Download slides](6-js-in-html-and-dom-slides.html) |
+| 2 | [HTML basics](2-html.md)                         | [Download slides](2-html-slides.html)               |
+| 3 | [CSS](3-css.md)                                  | [Download slides](3-css-slides.html)                |
+| 4 | [Bootstrap](4-bootstrap.md)                      | [Download slides](4-bootstrap-slides.html)          |
+| 5 | [JS in HTML & DOM](5-js-in-html-and-dom.md)      | [Download slides](5-js-in-html-and-dom-slides.html) |
+|   | [HTTP](2-http.md)                                | [Download slides](http-slides.html)               |