WIP Add initial webapp frontend

[allcaps]

Idea is to create the plain html/css in webapp_tmp and then (when it is reasonable) move it to Tidianes webapp.

In project root do:

yarn
yarn watch   # file watcher
yarn frontend   # single dev build (uncompressed)
yarn build   # production build (compressed)

[allcaps]

Drop, we use bg-primary.

[allcaps]

Not sure, maybe the width: 100% on textarea is enough.

[codecov-commenter]

Codecov Report

Merging #56 (d0a4f7a) into main (3395f47) will decrease coverage by 0.27%.
The diff coverage is 78.57%.

@@             Coverage Diff             @@
##              main      #56      +/-   ##
===========================================
- Coverage   100.00%   99.72%   -0.28%     
===========================================
  Files           40       41       +1     
  Lines         1072     1085      +13     
  Branches        98      100       +2     
===========================================
+ Hits          1072     1082      +10     
- Misses           0        1       +1     
- Partials         0        2       +2     

Impacted Files	Coverage Δ
...rc/wagtail_live/webapp/templatetags/webapp_tags.py	70.00% <70.00%> (ø)
src/wagtail_live/webapp/serializers.py	100.00% <100.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 3395f47...d0a4f7a. Read the comment docs.