fix: focus state inconsistency

[vatsalsinghkv]

Please describe the changes this PR makes and why it should be merged:

fixes #641

I have updated the nextra theme config, by changing primary hue for the dark mode.

This is the colour I picked according to the theme:

Status

• Code changes have been tested against prettier, or there are no code changes
• I know how to update typings and have done so, or typings don't need updating

Semantic versioning classification:

• This PR changes the codebase
  • This PR includes breaking changes (methods removed or renamed, parameters moved or removed)
  • This PR changes the internal workings with no modifications to the external API (bug fixes, performance improvements)
• This PR only includes non-code changes, like changes to documentation, README, etc.

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[CLAassistant]

All committers have signed the CLA.

[tobySolutions]

LGTM! Good job.

[aidenybai]

reverted this change. I don't believe this hue fits our color scheme.

[tobySolutions]

reverted this change. I don't believe this hue fits our color scheme.

Hmm, oh ok. I was gonna come back to this. I was seeing some weirdness.