Add Material icons to all pages, rewrite examples page as step-by-step guide

mkdocs.yml

@@ -37,10 +37,11 @@ theme:
 extra_css:
   # The ?v= suffix defeats browser caching of the stylesheet. Bump the number
   # whenever you change extra.css and the browser keeps showing the old style.
-  - stylesheets/extra.css?v=14
+  - stylesheets/extra.css?v=17
 
 extra_javascript:
   - javascripts/brand-notranslate.js   # keep "Bitcoin After Life" untranslated in Chrome
+  - javascripts/nav-section-icons.js   # small Material icon before each nav section title
 
 nav:
   - Home: index.md
@@ -66,7 +67,7 @@ nav:
       - Running a Will-Executor: will-executors/running-a-server.md
   - Protocol:
       - How it works: protocol/how-it-works.md
-  - REAL EXAMPLE: examples.md
+  - Example inheritance plan: examples.md
   - How BAL compares: comparison.md
   - Security & Privacy: security-privacy.md
 
@@ -91,6 +92,9 @@ markdown_extensions:
   - pymdownx.details
   - pymdownx.superfences
   - pymdownx.tabbed: { alternate_style: true }
+  - pymdownx.emoji:
+      emoji_index: !!python/name:material.extensions.emoji.twemoji
+      emoji_generator: !!python/name:material.extensions.emoji.to_svg
   - toc: { permalink: true }
 
 # --- Italian translation (not enabled yet) ------------------------------------