Docs readme update
State: closed

- [x] Helps with #23084 
- [x] No tests added / passed
- [x] passes `git diff upstream/master -u -- "*.py" | flake8 --diff`
- [x] Modified the process for updating forks in docs/README.rst to use git merge instead of git rebase. Also added the git command for setting upstream to pandas.


Labels:
name: Docs

Comments:
This all seems duplicative of the contributing page. How about we extract what isn't in there already and just change `doc/README.rst` to a link pointing to that?
# [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/23097?src=pr&el=h1) Report
> Merging [#23097](https://codecov.io/gh/pandas-dev/pandas/pull/23097?src=pr&el=desc) into [master](https://codecov.io/gh/pandas-dev/pandas/commit/c8ce3d01e9ffafc24c6f9dd568cd9eb7e42c610c?src=pr&el=desc) will **not change** coverage.
> The diff coverage is `n/a`.

[![Impacted file tree graph](https://codecov.io/gh/pandas-dev/pandas/pull/23097/graphs/tree.svg?width=650&token=eZ4WkYLtcO&height=150&src=pr)](https://codecov.io/gh/pandas-dev/pandas/pull/23097?src=pr&el=tree)

```diff
@@           Coverage Diff           @@
##           master   #23097   +/-   ##
=======================================
  Coverage    92.2%    92.2%           
=======================================
  Files         169      169           
  Lines       50924    50924           
=======================================
  Hits        46952    46952           
  Misses       3972     3972
```

| Flag | Coverage Δ | |
|---|---|---|
| #multiple | `90.62% <ø> (ø)` | :arrow_up: |
| #single | `42.3% <ø> (ø)` | :arrow_up: |


------

[Continue to review full report at Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/23097?src=pr&el=continue).
> **Legend** - [Click here to learn more](https://docs.codecov.io/docs/codecov-delta)
> `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
> Powered by [Codecov](https://codecov.io/gh/pandas-dev/pandas/pull/23097?src=pr&el=footer). Last update [c8ce3d0...4df506c](https://codecov.io/gh/pandas-dev/pandas/pull/23097?src=pr&el=lastupdated). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments).

+1 on what @TomAugspurger says. I personally wouldn't even bother on having a `README` in `docs/`, but if we have one, I'd just link to the contributing page.
I suggested a link to the contributing docs to not break links, but I
assume people don't expect URLs pointing inside the tree of a git repo to
be around forever.

On Fri, Oct 12, 2018 at 4:27 PM Marc Garcia <notifications@github.com>
wrote:

> +1 on what @TomAugspurger <https://github.com/TomAugspurger> says. I
> personally wouldn't even bother on having a README in docs/, but if we
> have one, I'd just link to the contributing page.
>
> —
> You are receiving this because you were mentioned.
> Reply to this email directly, view it on GitHub
> <https://github.com/pandas-dev/pandas/pull/23097#issuecomment-429467377>,
> or mute the thread
> <https://github.com/notifications/unsubscribe-auth/ABQHIsmIA2o0SnyH_uXXkCT9NBMBDiJyks5ukQk9gaJpZM4XYgsG>
> .
>

@alexander-l-stone can you update to @TomAugspurger suggestion.
Closing as stale. @alexander-l-stone if you want to continue working on it, please reopen or create a new PR, and refer to #23828.