Update sidebar to (dynamically) include all useful documentation

[OliverTod]

Issue:
The navigation sidebar on the Accord Project documentation website does not:

• contain all relevant/useful content that has been produced over the years; or
• dynamically update based on the content.

More detail:
There is a lot of good content in the broader Accord documentation that is not properly linked in the sidebar, but is still available through the search. From my review of the repository, most of it appears to be in one of several versioned document folders:

This suggests that the documents have deliberately not been included because they are out of date. Can someone who was involved in these recent documentation upgrades confirm this?

Proposed approach:

1. review all of the 'versioned' documentation to classify each item as (1) useful as-is, (2) easy to update or (3) no longer relevant;
2. manually update the navigation to include items in group (1);
   update and include items in group (2); and
3. meanwhile, work on making the navigation be dynamically created by the content (this doesn't look like it's supported out of the box by docusaurus sidebar element, but shouldn't be too hard to do)

[OliverTod]

Jolene, do you think you could allocate this issue to me? I will have a first crack at it.

[jolanglinais]

Nice!

[dselman]

Please beware that versions are managed by Docusaurus scripts -- do not modify any of the versioned files. I believe @jeromesimeon did most of the content clean-up for Cicero 0.20.

[OliverTod]

In terms of dynamically updating the sidebar: it looks like it could be achieved along these lines but I had a quick look at the other main users of docusaurus (eg React) and they aren't doing this.

I'm starting to think that this might be a feature that just gets in the way of docusaurus' versioning script - and the fix (manually updating the sidebars.json) is very straightforward.

[OliverTod]

For the first part of this issue though (that is, making sure we haven't missed any good content in any of the documentation updates), I have identified the following as potentially useful content that doesn't seem to have made its way into the current version:
advanced-hyperledger.md
advanced-nodejs.md
spec-concepts.md
spec-example.md
spec-execution.md
spec-instance.md
spec-template.md
spec-packaging.md
example-eatapple.md
markup-blocks.md
markup-cicero.md
markup-ergo.md
markup-variables.md
ref-cicero-ui.md

I also noticed that the following pages are up, but somewhat incomplete:
tutorial-vscode.md - @dselman has an excellent video tutorial which ends promising further videos (which I can't find)
ref-glossary - the glossary only addresses a handful of terms

This is by no means a complete list - but maybe @jeromesimeon could let me know if i'm heading in a useful direction.

[jolanglinais]

@OliverTod is there any update on this?