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Add admonition styling to odoc CSS and cleanup deprecated/dune

- Add CSS styles for @admonition.note, @admonition.warning,
@admonition.tip, and @admonition.important tags
- Styles include colored backgrounds and left borders:
- Note: blue (#2196F3)
- Warning: orange (#FF9800)
- Tip: green (#4CAF50)
- Important: red (#F44336)
- Remove redundant install stanza from deprecated/dune since the
parent doc/dune now handles these files via glob_files

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

+34 -6
+2 -6
doc/deprecated/dune
··· 1 - (install 2 - (section doc) 3 - (files 4 - (parent_child_spec.mld as odoc-pages/deprecated/parent_child_spec.mld) 5 - (index.mld as odoc-pages/deprecated/index.mld)) 6 - (package odoc)) 1 + ; This directory's mld files are included via the parent doc/dune documentation stanza. 2 + ; No separate install stanza needed.
+32
src/html_support_files/odoc.css
··· 770 770 .at-tags li { padding-left: 3ex; text-indent: -3ex; } 771 771 .at-tags .at-tag { text-transform: capitalize } 772 772 773 + /* Admonition styles - for @admonition.note, @admonition.warning, etc. */ 774 + 775 + .at-tags li[class^="admonition"] { 776 + padding: 1em; 777 + margin: 1em 0; 778 + border-left: 4px solid; 779 + border-radius: 4px; 780 + text-indent: 0; 781 + } 782 + .at-tags li[class^="admonition"] .at-tag { 783 + display: block; 784 + font-weight: bold; 785 + margin-bottom: 0.5em; 786 + } 787 + .at-tags li.admonition\.note, 788 + .at-tags li[class="admonition"] { 789 + border-color: #2196F3; 790 + background: #E3F2FD; 791 + } 792 + .at-tags li.admonition\.warning { 793 + border-color: #FF9800; 794 + background: #FFF3E0; 795 + } 796 + .at-tags li.admonition\.tip { 797 + border-color: #4CAF50; 798 + background: #E8F5E9; 799 + } 800 + .at-tags li.admonition\.important { 801 + border-color: #F44336; 802 + background: #FFEBEE; 803 + } 804 + 773 805 /* Alert emoji */ 774 806 775 807 .alert::before, .deprecated::before {