Update system-level doc links in projects README files

[StancaPop]

PR Description

Fixed the project README.md files:

• replaced the links that don't exist with "TO BE ADDED"
• added missing system-level doc links where they are available
• replace the wiki links with Github pages, if they were already ported

PR Type

• Bug fix (change that fixes an issue)
• New feature (change that adds new functionality)
• Breaking change (has dependencies in other repos or will cause CI to fail)
• Documentation

PR Checklist

• I have followed the code style guidelines
• I have performed a self-review of changes
• I have compiled all hdl projects and libraries affected by this PR
• I have tested in hardware affected projects, at least on relevant boards
• I have commented my code, at least hard-to-understand parts
• I have signed off all commits from this PR
• I have updated the documentation (wiki pages, ReadMe files, Copyright etc)
• I have not introduced new Warnings/Critical Warnings on compilation
• I have added new hdl testbenches or updated existing ones

[cristianmihaipopa]

Checked all the links & for trailing whitespaces. Looks good to me.