Anchor tags are still missing (#662)

Final commit wasn't pushed to #589 !

---------

Co-authored-by: Rebecca Dimock <66339736+beckykd@users.noreply.github.com>
Co-authored-by: Eric Arellano <14852634+Eric-Arellano@users.noreply.github.com>

docs/start/install.mdx

@@ -205,14 +205,14 @@ described in more detail below.
 
 
 <details>
-  <summary>
-    Release schedule
+  <summary  id="release-schedule">
+  Release schedule
   </summary>
-  A tentative release schedule is included below:
+A tentative release schedule is included below:
 
-  ![](/images/start/install/release_schedule.png)
+![](/images/start/install/release_schedule.png)
 
-  For an up-to-date release schedule, refer to the Qiskit Github project's
+For an up-to-date release schedule, refer to the Qiskit Github project's
 [milestones list](https://github.com/Qiskit/qiskit/milestones), which always contains the current release plan.
 
 With the release of a new major version, the previous major version is supported
@@ -257,7 +257,7 @@ dependency and the older version.
 
 
 <details>
-  <summary>
+  <summary id="upgrade-strategy">
   Upgrade strategy
   </summary>
 When a new major version is released, the recommended upgrade path
@@ -292,8 +292,8 @@ the newest version available by default.
 
 
 <details>
-<summary>
-  Pre-releases
+<summary id="pre-releases">
+Pre-releases
 </summary>
 For each minor and major version release, Qiskit publishes pre-releases that
 are compatible with [PEP440](https://peps.python.org/pep-0440/). Typically
@@ -309,8 +309,8 @@ a different final API than `1.0.0`.
 
 
 <details>
-<summary>
-  Post-releases
+<summary id="post-releases">
+Post-releases
 </summary>
 If there are issues with a release's packaging, a post-release might be
 issued to correct this. These will follow the form `X.Y.Z.1` where the fourth