Increase the default instance sizes

[peytondmurray]

Closes #1111 and #37

Changes introduced in this PR:

• Doubled the profile sizes for the small and medium workers.
• Doubled the node sizes across the board for all cloud providers
• Increased the default conda-store storage to 200G, and the shared filesystem to 200G as well
• Updated documentation to reflect these changes

Types of changes

What types of changes does your PR introduce?

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds a feature)
• Breaking change (fix or feature that would cause existing features to not work as expected)
• Documentation Update
• Code style update (formatting, renaming)
• Refactoring (no functional changes, no API changes)
• Build related changes
• Other (please describe): Increases the default node sizes and worker profile sizes across the board.

Testing

Requires testing

• Yes
• No

In case you checked yes, did you write tests?

• Yes
• No

Documentation

Does your contribution include breaking changes or deprecations?
If so have you updated the documentation?

• Yes, docstrings
• Yes, main documentation
• Yes, deprecation notices

Further comments (optional)

After talking to several people on the nebari team and checking some existing deployment profiles, I've doubled the node and profile sizes across the board. If others feel that we should increase these defaults further, I'm happy to make that change.

[iameskild]

This looks good to me!

Infracost cost breakdown would be nice in this situation, but I realize we're not touching any tf files so I'm not sure how we would handle that.

Anyway, thanks for this @peytondmurray 🎉