Revert to sync loading of css, sometimes js loaded before css which c…

build: adds branch info to binary build

Makefile: dependency-driven target to build node_modules

- added `node_modules` as new target
- dependency on `package.json` and `yarn.lock` allows for quick `make
  node_modules` after a branch change, which noops when the deps have
 not changed
- also added `clean` target

removes old invalid release guide

closes #13864

Merge branch 'fix-missing-points' of https://github.com/jsferrei/grafana into jsferrei-fix-missing-points

stackdriver: Remove redundant project name assignment

Fix label suggestions inside multi-line aggregation contexts

Implement sum aggregation suggestion with placeholder support

Fixing issue 13855

Related: #13615

Implements rudimentary support for placeholder values inside a string
with the `PlaceholdersBuffer` class. The latter helps the newly added
sum aggregation query suggestion to automatically focus on the label
so users can easily choose from the available typeahead options.

Related: #13615

Reduce re-renderings when changing view modes

This should cover use cases involving multi-line queries and range
vector syntax inside aggregation contexts.

Related: #12890

No label suggestions were being returned for multi-line aggregation
contexts because the parsed selector string does not see the full
context before a `by` or `without` clause.

This solution stitches together all text nodes that comprise the query
editor to ensure the selector has sufficient context to generate
suggestions.

Also, an additional workaround has been included to ensure range vector
syntax does not disrupt label suggestions in aggregation contexts.

Related: #12890

as 0.5 radius points
 - fixes https://github.com/grafana/grafana/issues/13605