Hotfix – styling adjustments

[fahdikrie]

solves #110, #111, and some other things:

• made some adjustments on detail jadwal's list view & toggle button
• added url to manual video on update matkul page
• hide buttons on shared jadwal if user is not authenticated
• added title on update matkul & contributor's page
• made the discord button on the login page disabled for the moment

snippets of what i did (kindly check the deploy preview for full observation :D):

[netlify[bot]]

✔️ Deploy Preview for susunjadwal ready!

🔨 Explore the source changes: 9535f9ee259f4d05b0720f7dc8e3c42c46f0591a

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😎 Browse the preview: https://deploy-preview-114--susunjadwal.netlify.app/