drop Makefile, update README

[privatemaker]

With gracious guidance from @ChristophWurst these changes "worked for me" and seem to be current across apps 😄

fixes #5478

[ChristophWurst]

Awesome

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.02% ⚠️

Comparison is base (4d3172f) 22.61% compared to head (933e503) 22.59%.
Report is 10 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5482      +/-   ##
============================================
- Coverage     22.61%   22.59%   -0.02%     
  Complexity      395      395              
============================================
  Files           241      241              
  Lines         11848    11854       +6     
  Branches       2306     2306              
============================================
  Hits           2679     2679              
- Misses         9169     9175       +6     

Flag	Coverage Δ
javascript	13.81% <ø> (-0.01%)	⬇️
php	64.26% <ø> (ø)

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see 1 file with indirect coverage changes

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[tcitworld]

Most other NC projects still have Makefiles as well, I would wait for different opinions (especially from the ones who made the work at https://nextcloud.com/contribute/ and https://nextcloud.com/developer/ first to see what they prefer).

Otherwise we can just fix it if we keep it

[privatemaker]

Most other NC projects still have Makefiles as well

@tciworld the Makefile is broken and relying on files that no longer exist. It is my understanding from @ChristophWurst and other devs on server team the current approach of NC is to move away from Makefiles entirely and instruct users only to use lang specific tools manually (composer and npm).

[ChristophWurst]

We chatted about it here at the conference and the developer's view seems to be that we want people to know npm and composer because they need these tools to do any meaningful changes. The makefile adds an unnecessary abstraction.

Ref nextcloud/documentation#11121

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