feat(theme): add Vesper Light & Oscura themes (@SameerJS6)

[SameerJS6]

Description

Adds Vesper Light and Oscura themes. Oscura by Fey.

Checks

• Adding quotes?
  • Make sure to include translations for the quotes in the description (or another comment) so we can verify their content.
• Adding a language?
  • Make sure to follow the languages documentation
  • Add language to packages/schemas/src/languages.ts
  • Add language to exactly one group in frontend/src/ts/constants/languages.ts
  • Add language json file to frontend/static/languages
• Adding a theme?
  • Make sure to follow the themes documentation
  • Add theme to packages/schemas/src/themes.ts
  • Add theme to frontend/src/ts/constants/themes.ts
  • Add theme css file to frontend/static/themes
  • Add some screenshot of the theme, especially with different test settings (colorful, flip colors) to your pull request
• Adding a layout?
  • Make sure to follow the layouts documentation
  • Add layout to packages/schemas/src/layouts.ts
  • Add layout json file to frontend/static/layouts
• Adding a font?
  • Make sure to follow the themes documentation
  • Add font file to frontend/static/webfonts
  • Add font to packages/schemas/src/fonts.ts
  • Add font to frontend/src/ts/constants/fonts.ts
• Check if any open issues are related to this PR; if so, be sure to tag them below.
• Make sure the PR title follows the Conventional Commits standard. (https://www.conventionalcommits.org for more info)
• Make sure to include your GitHub username prefixed with @ inside parentheses at the end of the PR title.

Closes #

Preview

Vesper Light

Home Route

Settings Route

Result Route

Oscura

Home Route

Settings Route

Result Route

Toasts Theme For Vesper Light & Oscura

[fehmer]

Oscura is very similar to Alduin

[SameerJS6]

Oscura is very similar to Alduin

I can understand where you’re coming from, and I also think these two themes are quite similar (main color). However, Oscura has higher saturation and contrast, so I think they can coexist, no?