devenv: various fixes for Loki docker block

Ace editor issues

fix: Data source picker in panel queries options should overlap content below, including ace scrollbar #15122

Explore - UI panels state persistance in url

fix util for splitting host and port

Now you can provide both a default host and a default port

Add support for AWS/Neptune in Cloudwatch

Fix save provisioned dashboard modal

Legend toggle should only trigger a re-render, not a refresh

Add pointer cursor to colorpicker

setting margin on label in datasourcelist

introduce samesite setting for login cookie

Clearify the Run from master instructions

WIP: Loki query editor for dashboard panels

React panel table data fix

Especially for new developers to the go and yarn ecosystems this readme part is quite confusing.

ref #15067