add explicit content-type header for image/webp

Add missing k-diffusion sigma params to infotext

Gradio theme cache

Allow `s_noise` override to actually be used

don't save incomplete images

Update README.md

Increase `s_churn` max value

Add option for `s_tmax`

Correct install instructions on linux and provide additional required apt packages
Fixes #12351

add new gradio themes

only need Reload UI not Restart

Add TAESD(or more) options for all the VAE encode/decode operation