Site: Remove committer by request process

The committer by request process was introduced after a discussion [1] in the dev list.

However, internal discussions on private@calcite showed that not everyone in the PMC is fully inline with this special process.

Moreover, the process is against the notion of becoming committer based on "merit" [2].

[1] https://lists.apache.org/thread/nm4zgddkyjb0qzonv8pgcnn6h76x2orb
[2] https://www.apache.org/foundation/governance/pmcs.html#merit

Close #3638

site/develop/index.md

@@ -359,49 +359,3 @@ You can contribute by testing the code, helping verify a release, writing docume
 the web site, or just by answering questions on the list.
 
 After you have made several useful contributions we may invite you to become a [committer](https://community.apache.org/contributors/).
-The most common way of becoming a committer is by contributing regularly to the project. In some
-exceptional cases you can bypass the invitation process as described below.
-
-If you are a committer in another **ASF project** (such as Drill, Flink, Hive, Ignite, Phoenix, etc.)
-and you are familiar with the Calcite codebase you can request explicitly from the Calcite PMC to
-consider your for committership. You can do that by sending an email to [[email protected]](mailto:[email protected])
-including the following information (template below):
-* Apache ID, you must have one if you are committer;
-* links to commits, discussions, presentations, blogs, etc., demonstrating your experience with
-Calcite.
-
-{% highlight text %}
-Subject: [REQUEST] New committer: Stamatis Zampetakis
-To: [email protected]
-
-Hi all,
-
-My name is Stamatis Zampetakis and my Apache ID is zabetak:
-https://home.apache.org/phonebook.html?uid=zabetak
-
-I am a Hive committer and have been working with Calcite for the past 2 years.
-I contributed various improvements and fixes in the cost based optimizer of
-Hive, which relies on Calcite, and I am pretty familiar with the Calcite
-codebase. Below you can find a list of contributions in the Hive repo that are
-related with Calcite:
-
-* https://github.com/apache/hive/commit/f29cb2245c97102975ea0dd73783049eaa0947a0
-* https://github.com/apache/hive/commit/efae863fe010ed5c4b7de1874a336ed93b3c60b8
-* https://github.com/apache/hive/commit/587c698fa25ca6da46d9c02e4199689426fec40f
-* https://github.com/apache/hive/commit/9087fa93cd785223f4f2552ec836e7580c78830a
-* https://github.com/apache/hive/commit/0616bcaa2436ccbf388b635bfea160b47849553c
-* https://github.com/apache/hive/commit/6f7c55ab9bc4fd7c3d0c2a6ba3095275b17b3d2d
-* https://github.com/apache/hive/commit/a0faf5ecb196a20cfef64d554df54961e8c074a7
-* https://github.com/apache/hive/commit/4f4cbeda00d5ebb7d0b8cedee5daa2c03df4a755
-* https://github.com/apache/hive/commit/6f2b8883c44edcf57538f3b1da2c5a599b0c5862
-* https://github.com/apache/hive/commit/170d5b4c3edf2daaa47ef3299277d44def4d39a7
-
-I would like to become a Calcite committer and help the project as much as I can.
-
-Best,
-Stamatis
-
-{% endhighlight %}
-
-After receiving your email the PMC will evaluate your request and get back to you in 1-2 weeks
-(usually a vote for adding a new committer takes ~7days).