[docs] best practices for upgrading zenml server

[wjayesh]

Describe changes

I added a new section: how-to/manage-zenml-server with best practices around upgrading and using the zenml server.

• a new guide on how to use ZenML server in production with all the information that we have personally from deploying and managing ZenML Pro.
• a new guide on how to navigate upgrades of ZenML server with regards to user pipelines and artifacts
• general best practices for upgrading zenml
• removed the zenml deploy command and moved the migrations guide to this section
• subsumed the existing upgrade zenml pages into this new section

Pre-requisites

Please ensure you have done the following:

• I have read the CONTRIBUTING.md document.
• If my change requires a change to docs, I have updated the documentation accordingly.
• I have added tests to cover my changes.
• I have based my new branch on develop and the open PR is targeting develop. If your branch wasn't based on develop read Contribution guide on rebasing branch to develop.
• If my changes require changes to the dashboard, these changes are communicated/requested.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Other (add details above)

[github-actions]

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321 images did not require optimisation.

Update required: Update image-actions configuration to the latest version before 1/1/21. See README for instructions.

[github-actions]

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docs/book/.gitbook/assets/aws-rds-backups.png	52.29 KB	47.88 KB	-8.4%	View diff
docs/book/.gitbook/assets/server_migration_1.png	132.60 KB	115.14 KB	-13.2%	View diff
docs/book/.gitbook/assets/server_migration_2.png	115.52 KB	104.53 KB	-9.5%	View diff

326 images did not require optimisation.

Update required: Update image-actions configuration to the latest version before 1/1/21. See README for instructions.

[github-actions]

Images automagically compressed by Calibre's image-actions ✨

Compression reduced images by 9.5%, saving 10.99 KB.

Filename	Before	After	Improvement	Visual comparison
docs/book/.gitbook/assets/server_migration_2.png	115.24 KB	104.25 KB	-9.5%	View diff

328 images did not require optimisation.

Update required: Update image-actions configuration to the latest version before 1/1/21. See README for instructions.

[htahir1]

Ok almost there! Can you sync to gitbook and give me a link please? id like to read the tabs and verify the images work!

[wjayesh]

@htahir1 this is the using-zenml-in-prod page deployed on my gitbook space https://zenml-io.gitbook.io/jayeshml/how-to/manage-your-zenml-server/using-zenml-server-in-prod

[htahir1]

Approved minus the conflicts