[PR] Convert the admin and editor UI from Bootstrap 3 to Boots trap 5.3 [roller]

mraible opened a new pull request, #156:
URL: https://github.com/apache/roller/pull/156

   Stacked on #155 (2/3 in the stack); review only the top commit.
   
   Converts the admin and editor UI from Bootstrap 3 to Bootstrap 5.3.8. The bootstrap form theme comes through struts2-bootstrap-plugin 6.1.0, which is Jakarta-native and emits Bootstrap 5 markup.
   
   No functionality is removed. Visual and behavioral deltas beyond the restyle, so nothing merges unnoticed:
   
   - Alert banners are dismissible again: the old Bootstrap 3 close-button markup rendered broken under Bootstrap 5, and a `.fade { opacity: 0 }` override in roller.css (a Bootstrap 3-era leftover) made any `fade show` component invisible — both fixed, auto-hide after 10 seconds unchanged
   - Entries/Comments count badges on the main menu are visible pills again (a bare `.badge` has no background in Bootstrap 5)
   - Themed submit buttons across ~25 JSPs now use the simple theme, so button pairs (Save/Cancel, Upload/Cancel, Yes/No, the entry editor's Save as Draft/Post to Weblog) sit on one row with a primary action instead of stacking in their own form rows
   - Field help renders as opt-in Bootstrap tooltips via a `tooltip.ftl` template override initialised in roller.js; the stylesheet editor's button hints use native title tooltips since the simple theme has no icon slot
   - bootstrap-icons replaces glyphicons
   - The profile page shows the OIDC issuer and subject as separate read-only fields instead of the raw federated identity string
   
   The result was audited page by page against a seeded master baseline: all 24 admin/editor pages were screenshot-compared with identical data on both sides. That comparison caught two regressions, fixed here: the entry editor's collapsible section headers rendered as blue links, and the date-picker calendar icons in the Entries/Comments sidebars wrapped below their inputs.
   
   


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