Update MAGE docs based on old Docusarus docs

[kgolubic]

We have to update some of the MAGE docs. The docs that need to be merged into this repo:

• https://github.com/memgraph/docs/pull/999
• https://github.com/memgraph/docs/pull/996
• https://github.com/memgraph/docs/pull/997

[kgolubic]

Note: Also we need to add this changes https://github.com/memgraph/docs/pull/1007/files

• badge icon
• change path for text.md from /python to /cpp in Release notes.