Site audit: fix broken images, add activity metadata, clean up content

- Remove broken image references from 25 MDX files (deleted spacer/content images)
- Add codingSkills and roverConcepts frontmatter to 24 activity pages
- Fix "Activity Demonstration" headings in 15 activity files (plain text -> h3)
- Remove unused "All" category from 89 MDX files
- Decode HTML entities (> <  ) in 9 content files
- Escape bare < > characters in MDX to fix build errors
- Standardize contact email to contact@micromelon.com.au
- Add missing description to rover-repair-request metadata
- Include previous session work: about-us updates, difficulty filtering,
  LearningPathway component, expanded schools list, new product/resource images

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

content/resources/micromelon-code-editor-283.mdx

@@ -1,7 +1,7 @@
 ---
 title: "Micromelon Code Editor 2.8"
 date: "2025-06-04"
-categories: ["News & Updates", "All"]
+categories: ["News & Updates"]
 tags: []
 excerpt: "Micromelon Code Editor 2.8.3 was released in April of 2025. This post will detail some important changes and how they will affect institutions. Change: Institution Account SystemThe ProblemPreviously in the Code Editor accounts were split between hom"
 featuredImage: "/images/resources/micromelon-code-editor-283.png"
@@ -35,8 +35,6 @@ Besides the old tools being updated to the invite system. There is now a new too
 
 #### What is a Quick Join Code?
 
-![](/images/content/e1773a-quick-join-code.png)
-
 Every class has a unique 9 digit Quick Join Code.
 
 You can share this with your students and they can use it to join your class & school without needing and invitation.
@@ -111,4 +109,4 @@ We’re always aiming to improve the Code Editor. In this release we have update
 
 To get the latest version,
 
-- Microsoft Users: Open the Code Editor. In the top bar click **File **->** Check for Updates **- Mac Users: Open the Code Editor. In the app menu click** Micromelon IDE **->** Check for Updates**.
+- Microsoft Users: Open the Code Editor. In the top bar click **File** -> **Check for Updates** - Mac Users: Open the Code Editor. In the app menu click **Micromelon IDE** -> **Check for Updates**.