bug(links): fix broken internal links

curriculum/section03/lectures/01_how_websites_work/README.md

@@ -19,7 +19,7 @@ Before we start creating websites of our own, it pays to have a rough idea of wh
 
 ### Step 1: Finding the IP address of the domain
 
-We're used to accessing websites using addresses like [www.google.com](www.google.com) and [www.facebook.com](www.facebook.com), but our browsers don't make use of these domain names directly. Instead they use IP addresses, which are used to identify Internet connected devices.
+We're used to accessing websites using addresses like `www.google.com` and `www.facebook.com`, but our browsers don't make use of these domain names directly. Instead they use IP addresses, which are used to identify Internet connected devices.
 
 When we type the URL for a given site, our browser has to figure out which IP address corresponds to the site we're trying to access. This process is called *domain name resolution*.
 

curriculum/section04/lectures/01_elements/README.md

@@ -29,7 +29,7 @@ We'll look at some examples thoughout this chapter.
 
 We can place other tags between the start and end tags of other elements, and this is how we construct a hierarchy within the document. We can also place plain text between tags, which is generally how we add text content to a page.
 
-We'll covered nesting HTML elements in more detail [later in this section](../07_nesting_elements/README.md).
+We'll covered nesting HTML elements in more detail [later in this section](../05_nesting_elements/README.md).
 
 ## An example HTML element
 

curriculum/section04/lectures/07_elements_which_cant_be_nested/README.md

@@ -13,7 +13,7 @@ draft: false
 
 # Which HTML elements can't be nested?
 
-This is not an easy question to answer, because different elements within a given content category permit wildly different content. For example, the `<a>` element and the `<select>` element are both [phrasing content](../06_html_categories/#phrasing-content); however, the `<a>` element is permitted to contain any non-interactive [flow content](../06_html_categories/#flow-content), while `<select>` is limited to zero or more `<option>` or `<optgroup>` elements.
+This is not an easy question to answer, because different elements within a given content category permit wildly different content. For example, the `<a>` element and the `<select>` element are both [phrasing content](../04_html_categories/#phrasing-content); however, the `<a>` element is permitted to contain any non-interactive [flow content](../04_html_categories/#flow-content), while `<select>` is limited to zero or more `<option>` or `<optgroup>` elements.
 
 Navigating this tangle of element relationships is one of the hardest parts about writing good HTML. Luckily there are great resources out there which can help us, such at the [MDN](https://developer.mozilla.org/).
 

curriculum/section06/lectures/13_html_form_textarea/README.md

@@ -30,7 +30,7 @@ So we can add a textarea to our form like this:
 There are a few things to note here:
 
 - I'm using `POST` because an entry could be quite long, and extremely long URLs can lead to problems and are unsightly.
-- The `<textarea>` is not a [void element](/section03/lectures/01_elements/), but it doesn't have any content. You can place pre-written content inside the textarea within the tags.
+- The `<textarea>` is not a [void element](/section04/lectures/01_elements/), but it doesn't have any content. You can place pre-written content inside the textarea within the tags.
 
 ## Grouping inputs and their labels