META - Update migrated documentation

[pavithraes]

Documentation was recently migrated into Docusaurus and new structure. This issue tracks updating various pages:

conda-store

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1. Introduction (update with learning paths) - Add standalone installation docs #724
2. How to - Standalone install - Add standalone installation docs #724
3. How to - Docker installation
4. How to - Kubernetes installation
5. [DOC] - Recommendations for cloud deployment #727 (how-to)
6. Tutorials - Using conda-store CLI
7. Tutorials - Using conda-store as shebang (move from how-to)
8. Explanations - Update conda-store explanations #726
9. References - Architecture docs

conda-store-ui

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1. Introduction (update with learning paths)
2. Explanations - UI Components
3. [DOC] Create tutorials for admin tasks #780
   area: documentation 📖 type: enhancement 💅🏼 +2

Community

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1. Contributing guidelines - [DOC] Update contributing guidelines #763
2. [DOC] - Document a release policy #753
   area: community 🌱 area: documentation 📖 type: enhancement 💅🏼 +3
   

[pavithraes]

Note to add the following section in conda-store-UI's how-to's around admin settings:

This was originally documented with artifacts, but removed in #726

#### Existing Deployments

conda-store saves environment settings and doesn't automatically update them on
startup (see `CondaStore.ensure_settings`). Existing deployments need to
manually enable installer builds via the admin interface. This can be done by
going to `<CondaStoreServer.url_prefix>/admin/setting/<namespace>/<env>/` (or
clicking on the `Settings` button on the environment page) and adding
`"CONSTRUCTOR_INSTALLER"` to `build_artifacts`.