update bootstrap and jQuery

hugo/static/PROVENANCE

+## bootstrap
+
+last update - 9may23
+
+from https://getbootstrap.com,
+download bootstrap-5.2.3-dist.zip,
+unzip
+export B=bootstrap-5.2.3-dist
+cd <bornagain>/hugo/static
+mv $B/js/bootstrap.js js/
+mv $B/js/bootstrap.js.min js/
+mv $B/css/bootstrap.css css/
+mv $B/css/bootstrap.css.min css/
+
+== jQuery
+
+last update - 9may23, prompted by FZJ security audit
+
+from https://jquery.com/download/
+- download the compressed, production jQuery
+- download the uncompressed, development jQuery
+
+mv /io/jquery-3.6.4.js jquery.js
+mv /io/jquery-3.6.4.min.js jquery.min.js