Add initial images for chapters 4 and 5

- Added ch04-init.png for chapter 4 initialization visuals.
- Added ch05-community.png for chapter 5 community visuals.

Author: DanWahlin

docs/assets/css/style.css

@@ -165,16 +165,7 @@ body.home{display:flex;flex-direction:column;min-height:100vh}
   .badge{width:38px;height:38px;font-size:1.05rem;top:-12px;left:-8px}
   .cap-link{font-size:.8rem;padding:6px 12px}
 }
-/* ===== starter engagement layer: scroll reveal - typewriter - copy ===== */
-/* Hidden initial state is only armed once JS adds .anim-ready, so no-JS and
-   reduced-motion users still see every frame fully rendered. */
-.anim-ready main.strip .cell{opacity:0;transform:translateY(26px);
-  will-change:opacity,transform;
-  transition:opacity .6s cubic-bezier(.22,.61,.36,1),transform .6s cubic-bezier(.22,.61,.36,1)}
-.anim-ready main.strip .cell.in-view{opacity:1;transform:none}
-.anim-ready main.strip .cell .badge{transform:scale(.2);opacity:0;
-  transition:transform .5s cubic-bezier(.34,1.56,.64,1) .14s,opacity .3s ease .14s}
-.anim-ready main.strip .cell.in-view .badge{transform:scale(1);opacity:1}
+/* ===== starter engagement layer: typewriter - copy ===== */
 /* per-command copy buttons: real HTML <button>s overlaid on the terminal bar
    (kept OUTSIDE the role="img" panel SVG so they stay keyboard/AT accessible).
    Positioned by % over .panel-wrap, which exactly bounds the fixed-ratio SVG. */
@@ -256,12 +247,10 @@ body.home .home-intro .cap{animation:home-fade-up .55s ease .3s both}
 body.home .home-intro .panel > g{transform-box:fill-box;transform-origin:center;
   animation:home-bubble-pop .55s cubic-bezier(.34,1.56,.64,1) both}
 body.home .home-intro .panel > g:nth-of-type(1){animation-delay:.6s}
-body.home .home-intro .panel > g:nth-of-type(2){animation-delay:2.6s}
+body.home .home-intro .panel > g:nth-of-type(2){animation-delay:1.6s}
 body.home .home-intro .panel > g:nth-of-type(3){animation-delay:4.6s}
 /* CTA and chapter selector are NOT animated: they must be clickable immediately. */
 @media(prefers-reduced-motion:reduce){
-  .anim-ready main.strip .cell,
-  .anim-ready main.strip .cell .badge{opacity:1;transform:none;transition:none}
   .term-copy .tc-box,.term-copy .tc-box svg{transition:none}
   .cap-link{transition:none}
   body.home .banner-wrap,body.home .home-av,body.home .home-intro,