Add "Learn> Specifications" section

[jaimergp]

I would like to have a section similar to PyPA specifications, but for conda standards and schemas. This will aggregate CEPs in the relevant categories, and also reveal which areas require standardization.

Items

•  Propose skeleton: Start a Specifications section #255
•  Link to existing or ongoing CEPs when available, or at least relevant documentation to get started: Start a Specifications section #255
•  Write pages for CEPs that are already approved
  • Add spec page for channel identifiers #264
  • Add spec page for package identifiers #265
  • Add spec pages for menuinst standards #266
  • Add spec pages for text input files #267
  • Add spec pages for environment.yml files #268
• Write pages for CEPs that are still pending decision as of Nov 5th 2025:
  • CEP 29: MatchSpec minilanguage ceps#82 -> Add spec page for MatchSpec #388
  • CEP 30: Virtual packages ceps#103 -> Add spec page for Virtual Packages #387
  • CEP 31: Build provenance metadata ceps#113 -> Add spec page for build provenance #389
  • CEP 32: Management and structure of conda environments ceps#124 -> Add spec pages for environment contents and lifecycle #394
  • CEP 33: Version literals and their ordering ceps#132 -> Add spec page for versioning #390
  • CEP 34: Contents of conda packages ceps#133 -> Add spec page for package contents #393
  • CEP 35: Distributable package artifacts file formats ceps#134 -> Add spec page for archive file formats #391
  • CEP 36: Package metadata files served by conda channels ceps#135
  • CEP 37: conda-lock.yml lockfiles ceps#138 -> Add spec page for lockfiles #392
  • CEP 38: Channel-wide metadata files served by conda channels ceps#140 -> Add spec page for channeldata #395