## Summary
Add a Getting started page to the docs file.
## Checklist
- [x] This PR is linked to a **work item**
- [x] I have performed **self-review** of the code
- [na] I have written **tests** for any new functionality added with this PR
- [x] I have updated the **documentation** if this PR changes or adds functionality
- [x] I have run **pre-commit** checks for code style
Related work items: #1597
- Added ability to load sessions via PrimaiteSession
- PrimaiteSession loading test
- Added a NotImplemented RLlib loading for now
- Added the ability to load sessions for hardcoded agents
- Moved Session metadata parsing to utils
- SB3 Agent loading
- rename agent.py -> agent_abc.py
- rename hardcoded.py -> hardcoded_abc.py
- Tests
- Added in test asset that is used to load the SB3 Agent
## Summary
* Update observation space information and standardise formatting of code blocks in that section
* Remove non-ascii quotation characters
* Update custom blue agent page to match new AgentSession classes.
* Introduce glossary
* Provide a first draft of migration guide for 1.2 to 2.0 (probably not comprehensive)
## Test process
Sphinx is able to build the documentation as checked on my local machine
## Checklist
- [x] This PR is linked to a **work item**
- [x] I have performed **self-review** of the code
- [ ] I have written **tests** for any new functionality added with this PR
- [x] I have updated the **documentation** if this PR changes or adds functionality
- [x] I have run **pre-commit** checks for code style
Related work items: #1602
## Summary
Training configs now have 2 different types of episode and step counts - one for train and one for evaluation.
`num_train_episodes`
`num_train_steps`
`num_eval_episodes`
`num_eval_steps`
## Test process
A test file `test_train_eval_episode_steps.py` has been implemented which runs train and evaluation session on two particular configs.
The train and evaluation sessions have different episodes and step count and the test checks that the output log files have the correct number of `total_steps` and `total_episodes`.
## Checklist
- [X] This PR is linked to a **work item**
- [X] I have performed **self-review** of the code
- [X] I have written **tests** for any new functionality added with this PR
- [X] I have updated the **documentation** if this PR changes or adds functionality
- [X] I have run **pre-commit** checks for code style
Related work items: #1566, #1589
## Summary
Unfortunately, I had to do away with the nice and neat matrix strategy for builds, because they do not support conditionals. Instead, I manually replicated the behaviour of the matrix but added a conditional to run every platform only when the 'build reason' is PR.
## Test process
*How have you tested this (if applicable)?*
## Checklist
- [x] This PR is linked to a **work item**
- [x] I have performed **self-review** of the code
- [ ] I have written **tests** for any new functionality added with this PR
- [ ] I have updated the **documentation** if this PR changes or adds functionality
- [x] I have run **pre-commit** checks for code style
Related work items: #1603
