Fix display version behavior

[viniciusdc]

Fixes | Closes | Resolves #1274

Changes introduced in this PR:

• Add a condition to set theme version programmatically when display_version is True;
• bump qhub-jupyterhub-theme==0.3.5 to fix the conflicting behavior for the dashboards page and version display;
• Fix some doc typos

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• New feature (non-breaking change which adds a feature)
• Breaking change (fix or feature that would cause existing features to not work as expected)
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[iameskild]

Thanks for this @viniciusdc! I'm not sure what is going on but I redeployed the beta deployment and it seems to have fixed the issue for some reason:

I'm not really sure what is going on here haha

[viniciusdc]

Thanks for this @viniciusdc! I'm not sure what is going on but I redeployed the beta deployment and it seems to have fixed the issue for some reason:

I'm not really sure what is going on here haha

I've manually committed the version tag to theme.jupyterhub so it's using that to propagate the version. This PR adds an auto-configuration in case display_version is passed but version is not. (Right now, it will default to v0.0.1 from the theme config when such key is not present)