fix nightly test on tutorials

[roywei]

Description

fix #14026

1. add scipy dependency
2. change trainning epochs to 1 to avoid test timeout

1&2 shoud fix #14026

made additional follow ups on the tutorials:
3. added tutorials to index
4. change tutorial links to use website link instead of github md file links
5. removed unecessary bash
6. removed bold effect in table which is not rendering correctly in hybrid tutorial

Checklist

Essentials

Please feel free to remove inapplicable items for your PR.

• Changes are complete (i.e. I finished coding on this PR)
• All changes have test coverage:
• Unit tests are added for small changes to verify correctness (e.g. adding a new operator)
• Nightly tests are added for complicated/long-running ones (e.g. changing distributed kvstore)
• Build tests will be added for build configuration changes (e.g. adding a new build option with NCCL)
• Code is well-documented:
• For user-facing API changes, API doc string has been updated.
• For new C++ functions in header files, their functionalities and arguments are documented.
• For new examples, README.md is added to explain the what the example does, the source of the dataset, expected performance on test set and reference to the original paper if applicable
• Check the API doc at http:https://mxnet-ci-doc.s3-accelerate.dualstack.amazonaws.com/PR-$PR_ID/$BUILD_ID/index.html
• To the my best knowledge, examples are either not affected by this change, or have been fixed to be compatible with this change

Comments

• If this change is a backward incompatible change, why must this change be made.
• Interesting edge cases to note here

[roywei]

@Chancebair @ThomasDelteil could you take a look? thanks!