fix preload bootstrap

[usingsky]

cannot read property of boostrap in main.js

Fixes #
Close button of flash message does not work.
cffbc237_main.js:204 Uncaught TypeError: element.append(...).alert is not a function at Function.notify.initialize (cffbc237_main.js:204) at HTMLDivElement.<anonymous> (cffbc237_main.js:204) at Function.each (86894786_jquery.js:15) at jQuery.fn.init.each (86894786_jquery.js:5) at cffbc237_main.js:204 at cffbc237_main.js:204

Proposed fixes:

preload bootstrap in main.js

Features:

• includes tests covering changes
• includes updated documentation
• includes user-visible changes
• includes API changes
• includes bugfix for possible backport

Please [X] all the boxes above that apply

[usingsky]

There is an additional problem.
ckan plugin can not use glyphicon.

condition :
ckan debug : false

Test :
$(“body").html('<span class="glyphicon glyphicon-search" aria-hidden="true"></span>')

Result :
GET http://127.0.0.1:5000/webassets/vendor/bootstrap/fonts/glyphicons-halflings-regular.woff2 net::ERR_ABORTED 404 (NOT FOUND)

[smotornyuk]

👍