* rewrite logger

* feat: add demo

* bump frontend 2.0.0-beta.50

* fix: nodejs 12.x compatibility

* chore: update dependencies

* feat: graph supports vertical and horizontal direction

* chore: update dependencies

* rename pages to remove trailing 's'

* feat: navbar support dropdown menu

* feat: audio sample page

* chore: update dependencies

* style: fix lint

* v2.0.0-beta.46

* chore: fix import method

* v2.0.0-beta.47

* chore: remove unused code

* v2.0.0-beta.48

* fix: navbar submenu overflow when hover

* v2.0.0-beta.49

* build: remove protobufjs dependency

* chore: support runtime config

* v2.0.0-beta.44

* fix: api url build config

* v2.0.0-beta.45

* fix: give up runtime config

* fix code style

* use publicPath config in i18n

* fix python app typo

* test: add test case

* feat: add chart tooltip in histogram overlay

* feat: add tooltip in histogram chart

* chore: update dependencies

* fix: compatibility of safari (#674)

* fix: graph export style missing

* bump 2.0.0-beta.6

* build: use stable channel of rust toolchain

* feat: support model graph from backend

* feat: add filename in graph api

* feat: support api token key in visualdl service