Fast Template Refs: use bind api and enable full screen (#2577)

[MarcSkovMadsen]

Addresses #2577

• use pn.bind
• make full screen work
• use accent color for plots.

[philippjfr]

Got a conflict now and if you could remove that weird hash in the notebook I'll merge.

[MarcSkovMadsen]

I've removed the hash @philippjfr

[codecov]

Codecov Report

Merging #2581 (3e9b6a7) into master (1d34e8c) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2581      +/-   ##
==========================================
- Coverage   83.17%   83.14%   -0.04%     
==========================================
  Files         184      184              
  Lines       23252    23264      +12     
==========================================
+ Hits        19341    19343       +2     
- Misses       3911     3921      +10     

Impacted Files	Coverage Δ
panel/compiler.py	6.66% <0.00%> (-0.34%)	⬇️
panel/io/reload.py	68.53% <0.00%> (+0.35%)	⬆️
panel/layout/flex.py	68.42% <0.00%> (+1.75%)	⬆️

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