[Epic]: Phase 2 Documentation

[samricotta]

Tutorials Page

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1. Add a tutorials page on the documentation and link to the above workshops #88
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2. Migrate workshop steps to tutorials - Mitigate front running #90
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3. Migrate workshop steps to tutorials - Oracle #92
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4. Clear https://github.com/cosmos/sdk-tutorials
5. Add the workshop code for oracle to the tutorial repo ^^
6. Add the workshop code for Mitigating front running to the tutorial repo ^^
7. Add tutorial into link at bottom of the page

Home page for each topic

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1. Homepage for Build #95
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2. Homepage for Learn #96
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3. Homepage for Users #97
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ABCI++ Page

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1. chore: add ABCI++ complete page #87
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2. Add documentation for vote extensions
3. Add documentation for prepare and process proposal

0.50 documentation to update

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1. Explain what is Precommiter and PrepareCheckState are and what you can do with it #104
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Misc

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1. Add in the additional headers from each of the topics within learn, build, users to the dropdown #112
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