This PR adds a splash screen for segments being open-sourced.
It looks like this:

## About the changes
I've more or less wholesale copied the demo dialog that @nunogois
implemented. I've put it in the `splash` directory for now (because
that's where it seemed most appropriate). The reason for straight
copying it instead of extending existing functionality is primarily that
this should be short-lived and deleted after the next release or so. So
isolating all the changes into a single directory seems like a good
idea.
## Discussion points
Because OSS installations don't connect to Unleash, we can't use feature
flags to control the rollout here. Instead, we must just assume that OSS
users will want to see it. If there is a better way we can control this,
that'd be great. I'd love to be able to use time constraints to not show
this after a certain date, for instance, but I don't think that's
something we can do right now?
The splash is also set to display on any page you're at when you first
load unleash. However, closing the dialog (either by closing or by
asking to see segments) will store that in localstorage, and you won't
be shown the dialog again.
---------
Co-authored-by: Nuno Góis <github@nunogois.com>
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## About the changes
- fixed spacing in sidebar
- consolidated info into one banner
closes
[#1-969/change-requests-ui-inconsistency](https://linear.app/unleash/issue/1-969/change-requests-ui-inconsistency)
## About the changes
Creating the first version of the Dark theme
Refactor: colors variables
Refactor: use theme variable instead
- this change will help us to use MuiCssBaseline, and we can use classes
directly for easy customization when we can't identify MUI classes
Refactor: adjusting some files components
- i’ve touched also the structure of some files, not only the colors
variables (but only to adjust the style, not functionality)
Fix: dark mode persistence on refresh (by Nuno)
Feat: dark mode sees light logos, and light mode sees dark logos (by
Nuno)
---------
Co-authored-by: Nuno Góis <github@nunogois.com>
## About the changes
Refactoring the colors for the light theme to be much easier to continue
with dark mode
This is the first step to finish dark mode
https://linear.app/unleash/project/[low][s][alpha]-dark-mode-in-unleash-admin-ui-31b407d13c4b/1
This PR uses `main-theme` as a placeholder for `dark-theme` for now due
to the new changes. Still need to set the correct values here.
---------
Co-authored-by: Nuno Góis <github@nunogois.com>
Signed-off-by: andreas-unleash <andreas@getunleash.ai>
Refactor App.styles.ts to styled components
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## About the changes
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### Important files
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## Discussion points
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Signed-off-by: andreas-unleash <andreas@getunleash.ai>
* fix: improve HTML landmarks
* refactor: footer headers should use h2
* refactor: fix header order on the feature overview page
* fix: make drawer logo clickable
* fix: wrap header links in <nav>
* fix: label breadcrumbs nav element
* refactor: remove unused breadcrumb.jsx
* fix: add search role to SearchField
* fix: correct heading order on form pages