loki: updates the logo

Add oauth_auto_login setting to defaults file

Fix pipeline aggregations on doc count

Making the setting configurable thru environment variable

docs: fix broken link on explore page

WIP docs for the new Explore feature

Filter tags select box on text input #14437

Docker blocks: Use links instead of bridge network

Explore: Improved line parsing for logging

Documentation for the new Explore feature.

Describes both the Prometheus-specific features and the
Loki (logging) features.

- changed log parser API to be more semantic: getting fields, getting values
- regexps become an implementation detail of parser and are no longer part of the API
- improved JSON parser to not be tripped by nested quotation marks
- improved JSON parser to support numbers
- added more tests

Fix time regions bugs

Fixed issue with colorpicker position above window

fixed issue with singlestat and repeated scopedVars

Fixed issue with logs graph and stacking

fixed issue with singlestat and repeated scopedVars, was only working for time series data sources, and only if there was any series, now scoped vars is always set, fixes #14367

Fix search tag UI issues

Fix time regions using zero hours

Allow backslash escaping in custom variables

Use correct variable name in fail text

Fix logs panel meta wrap

Explore: Hide scanning again after result was found

Explore: Logging dedup tooltips

Explore: dont pass all rows to all rows, fixes profiler

- react profiler seems to evaluate all props of all components down the tree
- this becomes slow when 1000 rows are passed to 1000 rows and their labels
- use getter function instead to ask for rows on demand