Introducing polls and dark mode

Kothakotha is now browsable in dark mode. View settings to change between light and dark mode.

Markdown now supports polls. Create single choice or multi-choice polls with up to 15 options.

Example format:

[poll]
prompt: Do you like the new changes?
options:
- Yes
- No
- Show Results
multipleChoice: false
expires: 7d
[/poll]

Set expiry date by day, hour, or minute.

Example expiries:

expires: 3d
expires: 2h
expires: 1m