doc: remove manual TOCs

doc/productivity.md

@@ -1,26 +1,5 @@
 # Productivity Notes
 
-## Table of Contents
-
-* [General](#general)
-   * [Cache compilations with `ccache`](#cache-compilations-with-ccache)
-   * [Disable features when generating the build system](#disable-features-when-generating-the-build-system)
-   * [Make use of your threads with `-j`](#make-use-of-your-threads-with--j)
-   * [Only build what you need](#only-build-what-you-need)
-   * [Compile on multiple machines](#compile-on-multiple-machines)
-   * [Multiple working directories with `git worktrees`](#multiple-working-directories-with-git-worktrees)
-   * [Interactive "dummy rebases" for fixups and execs with `git merge-base`](#interactive-dummy-rebases-for-fixups-and-execs-with-git-merge-base)
-* [Writing code](#writing-code)
-   * [Format C/C++ diffs with `clang-format-diff.py`](#format-cc-diffs-with-clang-format-diffpy)
-   * [Format Python diffs with `yapf-diff.py`](#format-python-diffs-with-yapf-diffpy)
-* [Rebasing/Merging code](#rebasingmerging-code)
-   * [More conflict context with `merge.conflictstyle diff3`](#more-conflict-context-with-mergeconflictstyle-diff3)
-* [Reviewing code](#reviewing-code)
-   * [Reduce mental load with `git diff` options](#reduce-mental-load-with-git-diff-options)
-   * [Fetch commits directly](#fetch-commits-directly)
-   * [Reference PRs easily with `refspec`s](#reference-prs-easily-with-refspecs)
-   * [Diff the diffs with `git range-diff`](#diff-the-diffs-with-git-range-diff)
-
 ## General
 
 ### Cache compilations with `ccache`