Update Bootstrap and dependent libraries

Title changed from Migrate from Bootstrap and dependent libraries to Update Bootstrap and dependent libraries

Open since 4 years, related: #211 (closed)

@prasad wrote last year vtiger open source would switch to bootstrap 5 with next major release

Added enhancement label

Milestone changed to 8.0.0

Bootstrap5 convention is different from earlier versions. Changing it would mean rebuilding new layout to CRM. We will review changes required to make this development easier.

removed time estimate

changed milestone to %8.x

closed with commit 15c410e2

Fixes to legacy pages - c8d4bca0

Fixes for popover - b8b055f3

changed milestone to %8.2.0

mentioned in issue #1456 (closed)