docs: quick fixes, various (#2387)

This PR:
- fixes the path to the Environments page
- adds anchors for 'flags' and 'placement'
- adds the 'en' suffix for partials and references to them
- adds a mutual link from the Environments page to the Custom Env Resources page

Tested with `mkdocs serve`.

Related: #2386. 

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

Author: huanjani

site/content/docs/concepts/environments.en.md

@@ -40,7 +40,9 @@ If you set up any service using one of the Load Balanced Service types, Copilot
 Optionally, when you set up an application, you can provide a domain name that you own and is registered in Route 53. If you provide a domain name, each time you spin up an environment, Copilot will create a subdomain environment-name.app-name.your-domain.com, provision an ACM cert, and bind it to your Application Load Balancer so it can use HTTPS.
 
 ## Customize your Environment
-Optionally, you can customize your environment interactively by using flags to import your existing resources, or configure the default environment resources. Currently, only VPC resources are customizable. However, if you want to customize more types of resources, feel free to bring your use cases and cut an issue!
+Optionally, you can customize your environment interactively by using flags to import your existing resources, or configure the default environment resources. Currently, only VPC resources are customizable. However, if you want to customize more types of resources, feel free to bring your use cases and cut an issue! 
+
+For more, see our [custom environment resources](../developing/custom-environment-resources.en.md) page.
 
 ## Digging into your Environment
 

site/content/docs/developing/custom-environment-resources.en.md

@@ -1,6 +1,6 @@
 # Custom Environment Resources
 
-When creating a new [environment](../../concepts/environments.en.md) with Copilot, you are given the option to import existing VPC resources. (Use [flags with `env init`](../commands/env-init.en.md) or the guided experience, shown below.)
+When creating a new [environment](../concepts/environments.en.md) with Copilot, you are given the option to import existing VPC resources. (Use [flags with `env init`](../commands/env-init.en.md#what-are-the-flags) or the guided experience, shown below.)
 ```bash
 % copilot env init
 What is your environment's name? env-name
@@ -20,4 +20,4 @@ When you select the default configuration, Copilot follows [AWS best practices](
 
 ## Considerations
 * If you are using a private hosted zone, [you must](https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/hosted-zone-private-considerations.html#hosted-zone-private-considerations-vpc-settings) set `enableDnsHostname` and `enableDnsSupport` to true.
-* To deploy internet-facing workloads in [private subnets](../include/common-svc-fields.md), your VPC will need a [NAT gateway](https://docs.aws.amazon.com/vpc/latest/userguide/vpc-nat-gateway.html). 
+* To deploy internet-facing workloads in [private subnets](../include/common-svc-fields.en.md#network-vpc-placement), your VPC will need a [NAT gateway](https://docs.aws.amazon.com/vpc/latest/userguide/vpc-nat-gateway.html). 

site/content/docs/include/common-svc-fields.md renamed to site/content/docs/include/common-svc-fields.en.md

@@ -64,8 +64,8 @@ The name of your service.
 <a id="type" href="#type" class="field">`type`</a> <span class="type">String</span>  
 The architecture type for your service. [Backend Services](../concepts/services.en.md#backend-service) are not reachable from the internet, but can be reached with [service discovery](../developing/service-discovery.en.md) from your other services.
 
-{% include 'image-config.md' %}
+{% include 'image-config.en.md' %}
 
-{% include 'image-healthcheck.md' %}
+{% include 'image-healthcheck.en.md' %}
 
-{% include 'common-svc-fields.md' %}
+{% include 'common-svc-fields.en.md' %}

site/content/docs/include/http-config.md renamed to site/content/docs/include/http-config.en.md

@@ -65,6 +65,6 @@ The name of your service.
 <a id="type" href="#type" class="field">`type`</a> <span class="type">String</span>  
 The architecture type for your service. A [Load Balanced Web Service](../concepts/services.en.md#load-balanced-web-service) is an internet-facing service that's behind a load balancer, orchestrated by Amazon ECS on AWS Fargate.
 
-{% include 'http-config.md' %}
-{% include 'image-config.md' %}
-{% include 'common-svc-fields.md' %}
+{% include 'http-config.en.md' %}
+{% include 'image-config.en.md' %}
+{% include 'common-svc-fields.en.md' %}