doc: assign ids to many headings

without stable ids on headings we cannot generate stable links to these
headings. nrd complains about this, but the current docbook workflow
does not.

a few generated ids remain, mostly in examples and footnotes. most of
the examples are generated by nixdoc (which has since gained MD export
functions, and the MD export does generate IDs).

doc/languages-frameworks/haskell.section.md

@@ -160,7 +160,7 @@ All `haskell.packages.*` package sets use the same package descriptions and the
 of versions by default. There are however GHC version specific override `.nix`
 files to loosen this a bit.
 
-### Dependency resolution
+### Dependency resolution {#haskell-dependency-resolution}
 
 Normally when you build Haskell packages with `cabal-install`, `cabal-install`
 does dependency resolution. It will look at all Haskell package versions known
@@ -230,7 +230,7 @@ specification, test suites, benchmarks etc. by compiling and invoking the
 package's `Setup.hs`. It does *not* use or invoke the `cabal-install` binary,
 but uses the underlying `Cabal` library instead.
 
-### General arguments
+### General arguments {#haskell-derivation-args}
 
 `pname`
 : Package name, assumed to be the same as on Hackage (if applicable)
@@ -479,7 +479,7 @@ are especially useful when writing [overrides](#haskell-overriding-haskell-packa
 when you want to make sure that they are definitely included. However, it is
 recommended to use the more accurate ones listed above when possible.
 
-### Meta attributes
+### Meta attributes {#haskell-derivation-meta}
 
 `haskellPackages.mkDerivation` accepts the following attributes as direct
 arguments which are transparently set in `meta` of the resulting derivation. See
@@ -714,7 +714,7 @@ editor plugin to achieve this.
 
 ## Overriding Haskell packages {#haskell-overriding-haskell-packages}
 
-### Overriding a single package
+### Overriding a single package {#haskell-overriding-a-single-package}
 
 <!-- TODO(@sternenseemann): we should document /somewhere/ that base == null etc. -->
 
@@ -803,7 +803,7 @@ lib.pipe my-haskell-package [
 ]
 ```
 
-#### `haskell.lib.compose`
+#### `haskell.lib.compose` {#haskell-haskell.lib.compose}
 
 The base interface for all overriding is the following function:
 
@@ -826,7 +826,7 @@ following overview. Refer to the
 [documentation of `haskellPackages.mkDerivation`](#haskell-mkderivation)
 for a more detailed description of the effects of the respective arguments.
 
-##### Packaging Helpers
+##### Packaging Helpers {#haskell-packaging-helpers}
 
 `overrideSrc { src, version } drv`
 : Replace the source used for building `drv` with the path or derivation given
@@ -875,7 +875,7 @@ sometimes necessary when working with versioned packages in
 altogether. Useful if it fails to evaluate cleanly and is causing
 noise in the evaluation errors tab on Hydra.
 
-##### Development Helpers
+##### Development Helpers {#haskell-development-helpers}
 
 `sdistTarball drv`
 : Create a source distribution tarball like those found on Hackage
@@ -913,7 +913,7 @@ for debugging with e.g. `gdb`.
 
 <!-- TODO(@sternenseemann): shellAware -->
 
-##### Trivial Helpers
+##### Trivial Helpers {#haskell-trivial-helpers}
 
 `doJailbreak drv`
 : Sets the `jailbreak` argument to `true` for `drv`.
@@ -998,7 +998,7 @@ benchmark component.
 `dontCoverage drv`
 : Sets the `doCoverage` argument to `false` for `drv`.
 
-#### Library functions in the Haskell package sets
+#### Library functions in the Haskell package sets {#haskell-package-set-lib-functions}
 
 Some library functions depend on packages from the Haskell package sets. Thus they are
 exposed from those instead of from `haskell.lib.compose` which can only access what is
@@ -1062,7 +1062,7 @@ it does for the unstable branches.
 
 ## F.A.Q. {#haskell-faq}
 
-### Why is topic X not covered in this section? Why is section Y missing?
+### Why is topic X not covered in this section? Why is section Y missing? {#haskell-why-not-covered}
 
 We have been working on [moving the nixpkgs Haskell documentation back into the
 nixpkgs manual](https://github.com/NixOS/nixpkgs/issues/121403). Since this