bootstrap: swap BS4 (alexwine) CSS for bootstrap@5 npm

Completes the Bootstrap 4->5 migration now that every jQuery/BS4 widget is React
(navbar, carousel, dropdowns) — plus the feedback toggle here (Feedback.js:
global `$('#feedback-form').toggle()` -> React state).

- Load Bootstrap 5 CSS from the `bootstrap` npm package in client/index.js
  (imported first so app + component styles and react-bootstrap override it).
- Remove the `alexwine:bootstrap-4` meteor package (BS4 CSS + jQuery + BS4 JS).
  jQuery for jquery-validation still comes from the npm `jquery` dep.
- Utility renames to BS5: ml-auto->ms-auto, float-right->float-end,
  btn-block->w-100, data-toggle->data-bs-toggle (FromNow tooltip).
- forms.scss `.form-label` is no longer a shim (BS5 ships it); comment updated.

Full-app build boots clean; server suite 36 passing. Needs a visual staging pass
across all pages (BS4->5 shifts grid gutters/typography); forms should improve
since react-bootstrap v2 already emitted BS5 markup.

package-lock.json

@@ -13,7 +13,7 @@
         "@turf/buffer": "^5.1.5",
         "babel-runtime": "^6.26.0",
         "bcrypt": "^5.1.1",
-        "bootstrap-carousel-swipe": "0.0.6",
+        "bootstrap": "^5.3.8",
         "commonmark": "^0.28.1",
         "core-js": "^2.5.1",
         "crypto-random-hex": "^1.0.0",
@@ -2699,10 +2699,24 @@
         "node": ">=4.0.0"
       }
     },
-    "node_modules/bootstrap-carousel-swipe": {
-      "version": "0.0.6",
-      "resolved": "https://registry.npmjs.org/bootstrap-carousel-swipe/-/bootstrap-carousel-swipe-0.0.6.tgz",
-      "integrity": "sha1-FTn+656kduHRDRwwnWWb0WJZ/wo="
+    "node_modules/bootstrap": {
+      "version": "5.3.8",
+      "resolved": "https://registry.npmjs.org/bootstrap/-/bootstrap-5.3.8.tgz",
+      "integrity": "sha512-HP1SZDqaLDPwsNiqRqi5NcP0SSXciX2s9E+RyqJIIqGo+vJeN5AJVM98CXmW/Wux0nQ5L7jeWUdplCEf0Ee+tg==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/twbs"
+        },
+        {
+          "type": "opencollective",
+          "url": "https://opencollective.com/bootstrap"
+        }
+      ],
+      "license": "MIT",
+      "peerDependencies": {
+        "@popperjs/core": "^2.11.8"
+      }
     },
     "node_modules/brace-expansion": {
       "version": "1.1.7",