fix: move getPartials to generate-html to fix missing dependency

[eamon0989]

Description

handlebars is a dependency of @s1seven/schema-tools-utils, but it was not listed as a dependency. As @s1seven/schema-tools-utils is a dependency of @s1seven/schema-tools-generate-pdf, when trying to generate a PDF using Node-Red, it threw Error: Cannot find module 'handlebars'.

It appears that Lerna handled the dependency when using schema-tools locally, but when generate-pdf is used in a project where handlebars is not already present, it breaks.

Instead of adding handlebars as a dependency, this PR moves the function getPartials from utils to generate-html.

Updates all the URLS in fixtures to use schemas.s1seven.dev instead of schemas.s1seven.com.

Adds a handlebars alias to the webpack config in karma.conf.js to remove webpack errors based on the issue found here: https://github.com/handlebars-lang/handlebars.js/issues/953

Fixes s1seven/node-red-monorepo#4

Type of change

• [x] Bug fix (non-breaking change which fixes an issue)
• [x] Dependencies update

Checklist:

• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [ ] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [x] Any dependent changes have been merged and published in downstream modules

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0 Bugs
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8 Code Smells

73.1% Coverage
0.7% Duplication