[Node terms] Show related docs for children terms as well

Closes #680

See merge request !516

Resolve "Share link copy to clipboard"

See merge request !512

modify css on legend + graph settings parameters

Closes #743

See merge request !513

[graphql] simplify and_logic for get contexts for ngrams

See merge request !515

fix: disable button

See merge request !514

Resolve "Display graph parameters in legend"

Closes #706

See merge request !510

Feature flags hide

See merge request !511

update terms options
landing page stuff
community side

also rearrange top bar menu
also add format-ps (npm run format-ps)

Resolve "Share link copy to clipboard"

Closes #719

See merge request !496

Resolve "Upload file sends 'Nothing' as language which results in 400 error from backend"

See merge request !509

Resolve "`./install` doesn't work on Darwin"

See merge request !508

When user created a corpus with docs, there was an error that list is
missing.

This reverts commit b731bf1b.

Also, added .idea, .parcel-cache to .gitignore

Resolve frontend part of "Import/export in SQLite format"

See merge request !505