Update Hugo and nodeJS versions

[nathanrod]

Currently we are using outdated Hugo and NodeJS versions, to support future features it is required to update them.

[nathanrod]

Related to #745
Deployed to staging.
Since Nodejs was updated, the clientarea has to be also reviewed.

[gorkapernas]

Verified on staging, tested the website and client area, and nearly everything looks good, but an issue I found in the 'Apps' section.
It's probably not related to the HUGO updated, but there is a formatting issue in these two pages:
/apps-linux/
/apps-macos/

The commands in the instructions are not displayed properly, also there is a new section with instructions for the Signature Verification which is not in production (this section is in both macOS app and Linux app pages).

[nathanrod]

• Fixed code highlight style

Regarding the apps-macos page, it is not part of the PR, on staging is just different. Not sure if it is a change that will be merged to prod in the future or not.

[gorkapernas]

Verified fixed the issue with the code style, no more issues found in the website or client area.
This should be good to go.