Move the Wiki from HerbSearch to the documentation

[IssaHanou]

Removed the pages from the Wiki and added them to the documentation:

• First start of the Architecture
• Additional info in the Installation
• Moved the other files to docs/src/other which are not hosted in the documentation
• Cross referencing in the documentation is not fully correct

To review please check the online docs

[ReubenJ]

Nice! Can you open a PR from the documentation branch to master so that someone can review?

[ReubenJ]

Note: the code used in the guide is outdated (https://herb-ai.github.io/Herb.jl/dev/install/#3.-Run-some-example-code). SymbolTable should be grammar2symboltable.

[pwochner]

I made a new branch documentation-core-concepts and started:

• Moving the Herb Architecture and Core Concepts to a Pluto notebook. This way, we can execute the code examples and the CI picks up outdated code.
• Making the tutorial more concise (it is currently quite verbose).

I'll open a PR once it's ready for review.