minor typo fix and use orange

src/css/mk.css

@@ -260,7 +260,7 @@ li .keywords {
     --fg0: var(--b0);
     --fg: var(--b02);
     --rfg: #000;
-    --hl: var(--v);
+    --hl: var(--o);
 }
 
 img {

src/index.org

@@ -37,8 +37,7 @@ priority:
    referrer for all external links, etc...)
    {{{br}}}
 2. *Almost javascript free*; no js at all except for a single exception,
-   pages containing Math formulae are displayed using mathjax. That means
-   that even the CSS theme switcher does not use javascript.
+   pages containing Math formulæ are displayed using mathjax.
    {{{br}}}
 3. *Accessibility*; should be easy to read on a text browser so people with
    disabilities could easily consume it.