fix(css): drop body{} block to match live's effective styling

Stage's paragraph spacing was larger than live on text-heavy pages
(~4px per line). Root cause: when I converted the SCSS-style // comments
in praxis.css to /* */ a few iterations back, I accidentally revived
the body{} block that live's Grav asset pipeline silently drops at
build time. The block sets line-height: 24px (vs Bootstrap default
1.428 = ~20px) plus font-family Roboto and color #969595. The live
pipeline rejects the rule because the original `font-size: 14px; //13px;`
line has invalid CSS syntax — its minifier discards the whole
declaration. Browsers viewing my cleaned-up praxis.css accept the rule
and apply all properties.

Easiest way to match live exactly: remove the block. Bootstrap's body
defaults (Helvetica, line-height 1.428) now apply uniformly on stage,
matching the live render.

static/css/praxis.css

@@ -1,11 +1,10 @@
-body {
+/* body { } block dropped on purpose — the live Grav asset pipeline
-    font-family : 'Roboto', sans-serif;
+   dropped it too (its `font-size: 14px; //13px;` had an invalid SCSS
-    font-size   : 14px; /* 13px; */
+   line comment that the minifier rejected, taking the whole rule with
-    line-height : 24px;
+   it). Bootstrap's body defaults (Helvetica, line-height 1.428) apply
-    color       : #969595;
+   instead. Re-enabling the rule with our cleaner /* */ comments made
-    font-weight : 400;
+   line-height 24px effective again on stage, which inflated paragraph
-    background: #fff;
+   spacing on text-heavy pages compared to live. */
-    }
 
 /* --------------------------------------
 Global Typography