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 XXXX: MatchSpec minilanguage ceps#82
  • CEP XXXX: Virtual packages ceps#103
  • CEP XXXX: Management and structure of conda environments ceps#124
  • CEP XXXX: "Version strings and their ordering" ceps#132
  • CEP XXXX: Contents of conda packages ceps#133
  • CEP XXXX: Distributable package artifacts file formats ceps#134
  • CEP XXXX: Package metadata files served by conda channels ceps#135
  • Add CEP for conda-lock.yml lockfiles ceps#138
  • CEP XXXX: Channel metadata files served by conda channels ceps#140