docs(config): drop client-side keys and refresh per-wiki reference

Remove nested_syntaxes, maxhi and diary_start_week_day from the config
reference (block, tables and key lists) since the server no longer
consumes them, and note that language-tagged code fences are highlighted
automatically with no nested_syntaxes key.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

README.md

@@ -25,7 +25,9 @@ results.
 
 - Goto-definition (follow wikilinks), backlinks, hover preview,
   completion on `[[`, document outline, workspace symbol search.
-- Semantic-token highlighting (no syntax-file fallback needed).
+- Semantic-token highlighting (no syntax-file fallback needed). Code fences
+  tagged with a language (`{{{python … }}}`) get that language's syntax
+  automatically — no `nested_syntaxes` config needed.
 - Broken-link diagnostics and an orphan-page finder.
 - Folding: server-driven `foldingRange` by default, regex fallback when
   the server isn't ready.
@@ -217,10 +219,6 @@ require('nuwiki').setup({
       -- Checkbox progression characters: " .oOX" by default.
       listsyms         = ' .oOX',
       listsyms_propagate = true,
-      -- Inline highlighting: 6 heading levels by default.
-      maxhi            = 1,
-      -- Embed other syntaxes inside `{{{lang …}}}` fences.
-      nested_syntaxes  = {},
     },
   },
 
@@ -305,16 +303,13 @@ Each is a boolean. All default to `true` except `mouse`.
 | `diary_rel_path` | string | `'diary'` | path relative to `root` |
 | `diary_index` | string | `'diary'` | diary index page stem |
 | `diary_frequency` | string | `'daily'` | `'daily'` \| `'weekly'` \| `'monthly'` \| `'yearly'` |
-| `diary_start_week_day` | string | `'monday'` | weekday name |
-| `diary_caption_level` | int | `1` | `0`–`6` |
+| `diary_caption_level` | int | `1` | `1`–`6` (level of the index caption) |
 | `diary_sort` | string | `'desc'` | `'desc'` \| `'asc'` |
 | `diary_header` | string | `'Diary'` | any heading text |
-| `maxhi` | int (bool) | `1` | `0` \| `1` |
 | `listsyms` | string | `' .oOX'` | checkbox progression chars |
 | `listsyms_propagate` | bool | `true` | `true` \| `false` |
 | `list_margin` | int | `-1` | `-1` (auto) or `≥ 0` |
 | `links_space_char` | string | `' '` | char that replaces spaces in synthesised link paths |
-| `nested_syntaxes` | table | `{}` | `{ ['fence-lang'] = 'vim-syntax', … }` |
 | `auto_toc` | bool | `false` | `true` \| `false` |
 
 #### HTML export keys (per-wiki)