ISSUE-709: Update Hugo to v0.120.0

[zxvcv]

Fixes rendering emojis in code blocks.
Update Hugo to never version.

• Hugo updated to v0.120.0
• Dockerfile based on python:3.11.15 instead klakegg/hugo:0.107.0-ext-ubuntu

Changes

So we need Hugo version >= v0.120.0 to fix the issue with rendering emojis in code blocks .

Originally Docker image was based on klakegg/hugo images based on ubuntu but the newest image is there for version 0.111.3
which is not enough to fix the problem.

Current official images for hugo are available as ghcr.io/gohugoio/hugo but those are based on alpine, unfortunately netlify requires Deno (Netlify Edge Functions) and Deno dont support Alpine Linux (musl libc) denoland/deno#3711.

So I tried to install everything from scratch on ubuntu based image.
This leads me to install newest hugo version (v0.159.0).

But this time Docsy v0.6.0 is not compatible with newest version of Hugo (highest verion hugo that supports Docsy 0.6.0 is v0.128.x)
Website with Hugo version v0.128.x has some bugs (Few sections disappeared on the left navigation bar) so at the end I leave version v0.120.0 that seems to work fine.

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