[elpa] externals/ef-themes updated (92724735e8 -> 3105d096d4)

[ELPA Syncer]

elpasync pushed a change to branch externals/ef-themes.

      from  92724735e8 Add ef-themes-mixed-fonts user option
       new  3e3c54b3e4 Add ef-themes-variable-pitch-ui user option
       new  00de28be21 Update sample configuration
       new  d0f1b189df Tweak value of tab-line-close-highlight foreground
       new  3105d096d4 Stop using :style flat-button for Emacs 27 compat


Summary of changes:
 README.org   | 30 ++++++++++++++++++++++++++++++
 ef-themes.el | 48 ++++++++++++++++++++++++++++++++++++------------
 2 files changed, 66 insertions(+), 12 deletions(-)