chore(dev): remove obsolete build scripts

[ludofischer]

• remove buildPackages script
• remove scripts used only by buildPackages
• remove unused dev deps
• get rid of duplicate fs-extra by updating it to 9.1

buildPackages tries to keep the README by introspecting the code (it even imports the presets!) but right now it makes the docs worse (replaces a lot of plugin description with This plugin is loaded with its default configuration.) I think it's easier to write text by hand than fix this script.

[codecov-commenter]

Codecov Report

Merging #1145 (212e7ea) into master (b60f54b) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1145      +/-   ##
==========================================
- Coverage   96.43%   96.43%   -0.01%     
==========================================
  Files         116      116              
  Lines        3593     3592       -1     
  Branches     1054     1054              
==========================================
- Hits         3465     3464       -1     
  Misses        119      119              
  Partials        9        9              

Impacted Files	Coverage Δ
...ckages/postcss-ordered-values/src/rules/columns.js	100.00% <100.00%> (ø)

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[alexander-akait]

Maybe in this case we need write steps how to do release in this case, otherwise somebody from contributors can forget

[ludofischer]

Maybe in this case we need write steps how to do release in this case, otherwise somebody from contributors can forget

I don't think that's necessary. Ihave never used these scripts to do the release because I remember @anikethsaha already told me they were broken, so I don't think anyone is relying on them. They've probably never been updated since lerna was introduced to the repo (the READMEs must have been updated by hand for some time, since running the script destroys some of the information). They're not documented in CONTRIBUTORS.md either.

[alexander-akait]

hm, how you do release right now (steps)?

[ludofischer]

hm, how you do release right now (steps)?

The way it says in CONTRIBUTING.md :-) :

yarn lerna publish from-package

I think buildPackages mainly updated the READMEs. It does not even seem to keep the versions in sync in package.json I've kept the two other scripts buildMetadata and buildSiteMarkdown as they're used to build the website.