Split the toctree of guides into three broad categories:

- Installing Packages
    - Includes guides for installing and managing dependencies.
- Building and Publishing Projects
    - Includes guides for project configuration, distribution
- Miscellaneous
    - Guides that do not clearly fit into any of the above

This commit primarily affects the Guides index page; it does not create
nested lists for each category in the sidebar.

The pipenv team hit their April and May release targets, so the caveat about the seeming impasse of pipenv development no longer applies. However, it may benefit the user to know that the early access version of the package is available as pre-release in `pip`.

I re-ordered the phrasing to give the reader a sense of the big picture first. Also, I attempted to clarify the language about library vs application development. However, I am not sure if I captured the spirit of what was intended by those words by the previous author.

Per https://groups.google.com/d/msg/pypa-dev/rUNsfIbruHM/LCEx-CB5AgAJ
the pypa-dev Google Group is now decommissioned.
Pointing to distutils-sig and Discourse instead.

Signed-off-by: Sumana Harihareswara <sh@changeset.nyc>

Signed-off-by: Sumana Harihareswara <sh@changeset.nyc>

Update link to now-decommissioned mailing list

Per https://groups.google.com/d/msg/pypa-dev/rUNsfIbruHM/LCEx-CB5AgAJ
the pypa-dev Google Group is now decommissioned.
Using this opportunity to, as in
pypa/sampleproject#118, improve the example
author name and email address.

Signed-off-by: Sumana Harihareswara <sh@changeset.nyc>

Improve sample author email and name in guide

I removed some redundant language.

…usion

Update Packaging Python Project Tutorial

Make directory hierarchy more clear

Add a description of the trove-classifiers package to the list of key projects. Closes #714.

Co-authored-by: Dustin Ingram <di@users.noreply.github.com>

Add trove-classifiers to key projects

* Add initial draft of .pypirc specification

* Incorporate review feedback

* Link to spec from other docs

* Add subsections

Inspired by "Securing The .pypirc File" at
https://truveris.github.io/articles/configuring-pypirc/

Recommend permissions for .pypirc

Clarify wording about length of Project-URL

Updated key projects links per request

Updated if condition as per ticket

follow-up to #492
ref #95

Specify PEP 621

Co-authored-by: Pradyun Gedam <3275593+pradyunsg@users.noreply.github.com>

Update link to egg format

fix BigQuery examples

fix orphaned link

The "easy_install" references links to a section with "setuptools" as
the title. This title is then used as the link text, making the section
incomprehensible for people not familiar with the relationship between
pip, easy_install, and setuptools.

Use utf-8 to read README

Fix references with wrong link text

Organize index of guides into 3 categories

…ercase

GitHub seems to default to uppercase nowadays, and in PyPI terms
this is about API tokens instead of passwords as such.

Refs pypa/gh-action-pypi-publish#52 (review)

Spelling fixes

WIP: Add sdist format specification and metadata field (PEP 643)

This flips the order of "synonym" vs "meaning", to convey the meaning before using
a loaded term that'll link to the glossary. This should help make it less intimidating to
first-time readers as well as generally make it easier to follow the sentence.

The `resolved_revision` feature from the PEP is omitted for now.

It can be added later when we have implementation experience.

Fix typos

Grammatically updated the docs