[deps] Auth: Update bootstrap to v5 [SECURITY] (#4881)

* [deps] Auth: Update bootstrap to v5 [SECURITY]

* Update bootstrap and import dependencies in site.scss

* Update site.scss to include the theme color 'dark'

* Refactor site.scss to merge the 'primary-accent' theme color into the existing theme colors

* Update bootstrap classes for v5

* Refactor form layout in Index.cshtml and AddExistingOrganization.cshtml

* Revert change to the shield icon in the navbar

* Fix organization form select inputs

* Fixed search input sizes

* Fix elements in Providers and Users search

* More bootstrap migration

* Revert change to tax rate delete button

* Add missing label classes in Users/Edit.cshtml

* More component migrations

* Refactor form classes and labels in CreateMsp.cshtml and CreateReseller.cshtml

* Update package dependencies in Sso

* Revert changes to Providers/Edit.cshtml

* Refactor CreateMultiOrganizationEnterprise.cshtml and Providers/Edit.cshtml for bootstrap 5

* Refactor webpack.config.js to use @popperjs/core instead of popper.js

* Remove popperjs package dependency

* Restore Bootstrap 4 link styling behavior

- Remove default text decoration
- Add underline only on hover

* Update Bootstrap to version 5.3.3

* Update deprecated text color classes from 'text-muted' to 'text-body-secondary' across various views

* Refactor provider edit view for bootstrap 5

* Remove underline in Add/Create organization links in provider page

---------

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Rui Tome <rtome@bitwarden.com>
Co-authored-by: Rui Tomé <108268980+r-tome@users.noreply.github.com>

src/Admin/Sass/site.scss

@@ -1,4 +1,7 @@
 @import "webfonts.scss";
+@import "bootstrap/scss/functions";
+@import "bootstrap/scss/variables";
+@import "bootstrap/scss/mixins";
 
 $primary: #175DDC;
 $primary-accent: #1252A3;
@@ -7,7 +10,8 @@ $info: #555555;
 $warning: #bf7e16;
 $danger: #dd4b39;
 
-$theme-colors: ( "primary-accent": $primary-accent );
+$theme-colors: map-merge($theme-colors, ("primary-accent": $primary-accent));
+
 $font-family-sans-serif: 'Open Sans','Helvetica Neue',Helvetica,Arial,sans-serif, 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol';
 
 $h1-font-size: 2rem;
@@ -17,7 +21,7 @@ $h4-font-size: 1rem;
 $h5-font-size: 1rem;
 $h6-font-size: 1rem;
 
-@import "bootstrap/scss/bootstrap.scss";
+@import "bootstrap/scss/bootstrap";
 
 h1 {
     border-bottom: 1px solid $border-color;
@@ -49,3 +53,11 @@ h3 {
 .form-check-input {
     margin-top: .45rem;
 }
+
+a {
+    text-decoration: none;
+    
+    &:hover {
+      text-decoration: underline;
+    }
+}