Refresh local env with VSCode tasks

[mlbrgl]

Resolves #1381.

This adds local refresh tasks for wordpress (db & uploads) and grapher (db).

The refresh tasks can be run through VSCode:

• cmd + shift + p > "Tasks: Run Task"
• "refresh grapher" or "refresh wordpress".

In their default mode, the tasks download all assets (db dumps and wordpress uploads) and refresh all tables.

Check the comments in .vscode/tasks.json for additional usage scenarios.