fix blogtxt

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>
teach build_themes.py the alphabet

Bee A Ess E \0 is for base.
Bee A Ess E Dash is for base-jinja.
Bee Ell is for blogtxt.
Bee O O Tee Ess Tee Ar A Pee is for bootstrap.
Bee O O Tee Ess Tee Ar A Pee Dash is for bootstrap-jinja.
Bee O O Tee Ess Tee Ar A Pee Three is for bootstrap3.
Bee O O Tee Ess Tee Ar A Pee Three Dash Gee Ar A Dee I E En Tee Es is for bootstrap3-gradients.
Bee O O Tee Ess Tee Ar A Pee Three Dash Gee Ar A Dee I E En Tee Es Dash is for bootstrap3-gradients-jinja.
Bee O O Tee Ess Tee Ar A Pee Three Dash Jay is for bootstrap3-jinja.
I Pee Wye Tee Haitch O En \0 is for ipython.
I Pee Wye Tee Haitch O En Dash Ex Kay Cee Dee is for ipython-xkcd.
Em is for monospace.
O is for oldfashioned.
Pee is for planetoid.
Ar E A is for readable.
Ar E Vee E A Ell \0 is for reveal.
Ar E Vee E A Ell Dash is for reveal.
Zed E En \0 is for zen.
Zed E En Dash I is for zen-ipython.
Zed E En Dash Jay is for zen-jinja.

Signed-off-by: Chris “Kwpolska” Warrick <kwpolska@gmail.com>