DOC-5183, DOC-5170, DOC-5192 Astra Migration Toolkit, Migration index page, more Sideloader integration and clean up

[aimurphy]

• Index:
  • Attempt to create a proper index page, based on the Langflow and Astra CLI ones.
  • All existing content on this page was either retained/rewritten for the new index format or moved to another page. Much of the content was redundant of other pages anyways.
• Astra Migration Toolkit/Sideloader:
  • Add the migration tool compatibility matrix (per DOC-5170). Using emojis for now until the icon macro is supported.
  • Revise the supported releases partial to account for these additional sources.
• ZDM Phase 2:
  • Add a Sideloader page under ZDM Phase 2.
  • Add the new Sideloader + ZDM graphic
  • Tweak the titles of the other pages in this section
  • Condense redundant information on the Phase 2 intro page, and move the description of the DSBulk Migrator commands to the top of the DSBulk Migrator page.
• ZDM Planning:
  • Remove the preliminary-steps stub page, and, instead, add Next steps to each page in the planning section.
  • Add a Planning subsection to the ZDM intro page.
  • Add a line of introductory text between the title and the first H2 in Deployment and infrastructure considerations.
• Strengthen the overall narrative of the 4 tools and when to use them.
• Resolve the confusion about DSBulk Migrator vs DSBulk Loader.
• Add a Get started section:
  • Repurpose the components page into a first level page comparing the 4 main tools & option to create your own migration process.
  • Moved the product-specific migration paths to the first section until I can properly address that content.
  • Added a small page highlighting cluster compatibility. I need to do more work here in future iterations.

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[KimberlyFields]

I left some comments and questions regarding the landing page and nav structure. I did not review any other content.

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Pull requests with matching branch name doc-5183 included in the build:

• DOC-5183, DOC-5170, DOC-5192 Astra Migration Toolkit, Migration index page, more Sideloader integration and clean up #195 (this pull request)
• https://github.com/riptano/docs-common/pull/46
• DOC-5183 remove unused images or pull from common astra-cli-docs#21

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[plpesvc-ds]

Build successful! ✅
Pull requests with matching branch name doc-5183 included in the build:

• DOC-5183, DOC-5170, DOC-5192 Astra Migration Toolkit, Migration index page, more Sideloader integration and clean up #195 (this pull request)
• https://github.com/riptano/docs-common/pull/46
• DOC-5183 remove unused images or pull from common astra-cli-docs#21

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[plpesvc-ds]

Build successful! ✅
Pull requests with matching branch name doc-5183 included in the build:

• DOC-5183, DOC-5170, DOC-5192 Astra Migration Toolkit, Migration index page, more Sideloader integration and clean up #195 (this pull request)
• https://github.com/riptano/docs-common/pull/46
• DOC-5183 remove unused images or pull from common astra-cli-docs#21

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[KimberlyFields]

@aimurphy looks good. Thanks for making the changes. One minor nit is that in the preview build, on the landing page it looks like the heading for DSBulk Migrator is not level with the other headings.

[aimurphy]

Merging so I can proceed on other migration doc work, but will investigate further about the misaligned headings.